Core™ Processor Family Desktop and Intel® Pentium® Processor Family Desktop, and LGA1155 Socket

2nd Generation Intel® Core™ Processor Family Desktop and Intel® Pentium® Processor Family Desktop, and LGA1155 Socket

Thermal Mechanical Specifications and Design Guidelines (TMSDG)

Supporting the Intel® Core™ i7, i5 and i3 Desktop Processor Series and Intel® Pentium® Processor G800 and G600 Series May 2011

Document Number #: 324644-004 INFORMATION IN THIS DOCUMENT IS PROVIDED IN CONNECTION WITH INTEL® PRODUCTS. NO LICENSE, EXPRESS OR IMPLIED, BY ESTOPPEL OR OTHERWISE, TO ANY INTELLECTUAL PROPERTY RIGHTS IS GRANTED BY THIS DOCUMENT. EXCEPT AS PROVIDED IN INTEL'S TERMS AND CONDITIONS OF SALE FOR SUCH PRODUCTS, INTEL ASSUMES NO LIABILITY WHATSOEVER, AND INTEL DISCLAIMS ANY EXPRESS OR IMPLIED WARRANTY, RELATING TO SALE AND/OR USE OF INTEL PRODUCTS INCLUDING LIABILITY OR WARRANTIES RELATING TO FITNESS FOR A PARTICULAR PURPOSE, MERCHANTABILITY, OR INFRINGEMENT OF ANY PATENT, COPYRIGHT OR OTHER INTELLECTUAL PROPERTY RIGHT. Intel products are not intended for use in medical, life saving, or life sustaining applications. Intel may make changes to specifications and product descriptions at any time, without notice. Designers must not rely on the absence or characteristics of any features or instructions marked “reserved” or “undefined.” Intel reserves these for future definition and shall have no responsibility whatsoever for conflicts or incompatibilities arising from future changes to them. The processor and Intel Series 6 Chipset and LGA1155 socket may contain design defects or errors known as errata which may cause the product to deviate from published specifications. Current characterized errata are available on request. “Intel® Turbo Boost Technology requires a PC with a processor with Intel Turbo Boost Technology capability. Intel Turbo Boost Technology performance varies depending on hardware, software and overall system configuration. Check with your PC manufacturer on whether your system delivers Intel Turbo Boost Technology.For more information, see http://www.intel.com/technology/turboboost.” Enhanced Intel® SpeedStep® Technology See the Processor Spec Finder or contact your Intel representative for more information. Intel processor numbers are not a measure of performance. Processor numbers differentiate features within each processor family, not across different processor families. See www.intel.com/products/processor_number for details. Contact your local Intel sales office or your distributor to obtain the latest specifications and before placing your product order. Intel, Intel Core, Pentium, and the Intel logo are trademarks of Intel Corporation in the U.S and other countries. * Other brands and names may be claimed as the property of others. Copyright © 2011 Intel Corporation.

2 Thermal/Mechanical Specifications and Design Guidelines Contents

1Introduction...... 9 1.1 Reference Documents ...... 10 1.2 Definition of Terms ...... 10 2 Package Mechanical and Storage Specifications...... 13 2.1 Package Mechanical Specifications ...... 13 2.1.1 Package Mechanical Drawing...... 14 2.1.2 Processor Component Keep-Out Zones...... 14 2.1.3 Package Loading Specifications ...... 15 2.1.4 Package Handling Guidelines...... 15 2.1.5 Package Insertion Specifications...... 15 2.1.6 Processor Mass Specification...... 15 2.1.7 Processor Materials...... 16 2.1.8 Processor Markings...... 16 2.1.9 Processor Land Coordinates ...... 17 2.2 Processor Storage Specifications ...... 18 3 LGA1155 Socket ...... 19 3.1 Board Layout ...... 21 3.1.1 Suggested Silkscreen Marking for Socket Identification...... 22 3.2 Attachment to Motherboard ...... 22 3.3 Socket Components...... 23 3.3.1 Socket Body Housing ...... 23 3.3.2 Solder Balls ...... 23 3.3.3 Contacts ...... 23 3.3.4 Pick and Place Cover...... 24 3.4 Package Installation / Removal ...... 25 3.4.1 Socket Standoffs and Package Seating Plane...... 25 3.5 Durability ...... 26 3.6 Markings ...... 26 3.7 Component Insertion Forces ...... 26 3.8 Socket Size ...... 26 4 Independent Loading Mechanism (ILM)...... 27 4.1 Design Concept...... 27 4.1.1 ILM Assembly Design Overview ...... 27 4.1.2 ILM Back Plate Design Overview...... 28 4.1.3 Shoulder Screw and Fasteners Design Overview ...... 29 4.2 Assembly of ILM to a Motherboard...... 30 4.3 ILM Interchangeability ...... 32 4.4 Markings ...... 32 4.5 ILM Cover ...... 33 5 LGA1155 Socket and ILM Electrical, Mechanical and Environmental Specifications .. 37 5.1 Component Mass...... 37 5.2 Package/Socket Stackup Height ...... 37 5.3 Loading Specifications...... 38 5.4 Electrical Requirements...... 39 5.5 Environmental Requirements ...... 40 6 Thermal Specifications ...... 41 6.1 Thermal Specifications ...... 41 6.1.1 Intel® Core™ i7-2000 and i5-2000 Desktop Processor Series (Quad Core 95W) Thermal Profile...... 43

Thermal/Mechanical Specifications and Design Guidelines 3 6.1.2 Intel® Core™ i7-2000 and i5-2000 Desktop Processor Series (Quad Core 65W) and Intel® Core™ i3-2000 Desktop Processor Series (Dual Core 65W) , and Intel® Pentium® Processor G800 and G600 Series (Dual Core 65W) Thermal Profile..44 6.1.3 Intel® Core™ i5-2000 desktop Processor Series (Quad Core 45W) Thermal Profile...... 46 6.1.4 Intel® Core™ i5-2000 and i3-2000 Desktop Processor Series (Dual Core 35W) and Intel® Pentium® Processor G600 Series (Dual Core 35W) Thermal Profile...... 47 6.1.5 Processor Specification for Operation Where Digital Thermal Sensor Exceeds TCONTROL...... 48 6.1.6 Thermal Metrology...... 52 6.2 Processor Thermal Features ...... 53 6.2.1 Processor Temperature...... 53 6.2.2 Adaptive Thermal Monitor ...... 53 6.2.2.1 Frequency/VID Control...... 54 6.2.2.2 Clock Modulation ...... 55 6.2.2.3 Immediate Transition to combined TM1 and TM2 ...... 55 6.2.2.4 Critical Temperature Flag ...... 55 6.2.2.5 PROCHOT# Signal ...... 55 6.2.3 THERMTRIP# Signal ...... 56 6.3 Intel® Turbo Boost Technology ...... 56 6.3.1 Intel® Turbo Boost Technology Frequency...... 57 6.3.2 Intel® Turbo Boost Technology Graphics Frequency ...... 57 6.4 Thermal Considerations ...... 58 6.4.1 Intel® Turbo Boost Technology Power Control and Reporting ...... 58 6.4.2 Package Power Control ...... 59 6.4.3 Power Plane Control ...... 60 6.4.4 Turbo Time Parameter...... 60 7 PECI Interface ...... 61 7.1 Platform Environment Control Interface (PECI) ...... 61 7.1.1 Introduction...... 61 7.1.1.1 Fan Speed Control with Digital Thermal Sensor ...... 61 8 Sensor Based Thermal Specification Design Guidance ...... 63 8.1 Sensor Based Specification Overview (DTS 1.0) ...... 63 8.2 Sensor Based Thermal Specification ...... 65 8.2.1 TTV Thermal Profile...... 65 8.2.2 Specification When DTS value is Greater than TCONTROL...... 66 8.3 Thermal Solution Design Process ...... 67 8.3.1 Boundary Condition Definition ...... 67 8.3.2 Thermal Design and Modelling ...... 68 8.3.3 Thermal Solution Validation...... 68 8.3.3.1 Test for Compliance to the TTV Thermal Profile...... 68 8.3.3.2 Thermal Solution Characterization for Fan Speed Control ...... 69 8.4 Fan Speed Control (FSC) Design Process...... 70 8.4.1 Fan Speed Control Algorithm without TAMBIENT Data...... 70 8.4.2 Fan Speed Control Algorithm with TAMBIENT Data ...... 71 8.4.3 DTS 1.1 A New Fan Speed Control Algorithm without TAMBIENT Data ...... 73 8.4.4 Fan Speed Control Implementation Details ...... 75 8.5 System Validation...... 76 8.6 Thermal Solution Characterization...... 77 9 ATX Reference Thermal Solution ...... 79 9.1 Heatsink Thermal Solution ...... 79 9.2 Geometric Envelope for the Intel Reference ATX Thermal Mechanical Design...... 81

4 Thermal/Mechanical Specifications and Design Guidelines 9.3 Reference Design Components ...... 82 9.3.1 Extrusion ...... 82 9.3.2 Clip ...... 83 9.3.3 Core ...... 84 9.4 Mechanical Interface to the Reference Attach Mechanism...... 85 9.5 Heatsink Mass & Center of Gravity...... 87 9.6 Thermal Interface Material...... 87 9.7 Heat Pipe Thermal Considerations...... 87 10 Thermal Solution Quality and Reliability Requirements...... 89 10.1 Reference Heatsink Thermal Verification...... 89 10.2 Mechanical Environmental Testing ...... 89 10.2.1 Recommended Test Sequence...... 90 10.2.2 Post-Test Pass Criteria ...... 90 10.2.3 Recommended BIOS/Processor/Memory Test Procedures ...... 90 10.3 Material and Recycling Requirements ...... 91 11 Boxed Processor Specifications ...... 93 11.1 Introduction ...... 93 11.2 Mechanical Specifications ...... 94 11.2.1 Boxed Processor Cooling Solution Dimensions ...... 94 11.2.2 Boxed Processor Fan Heatsink Weight ...... 96 11.2.3 Boxed Processor Retention Mechanism and Heatsink Attach Clip Assembly ..... 96 11.3 Electrical Requirements...... 97 11.3.1 Fan Heatsink Power Supply...... 97 11.4 Thermal Specifications ...... 98 11.4.1 Boxed Processor Cooling Requirements ...... 98 11.4.2 Variable Speed Fan...... 100

Figures 2-1 Processor Package Assembly Sketch ...... 13 2-2 Package View ...... 14 2-3 Processor Top-Side Markings ...... 16 2-4 Processor Package Lands Coordinates ...... 17 3-1 LGA1155 Socket with Pick and Place Cover ...... 19 3-2 LGA1155 Socket Contact Numbering (Top View of Socket) ...... 20 3-3 LGA1155 Socket Land Pattern (Top View of Board) ...... 21 3-4 Suggested Board Marking...... 22 3-5 Attachment to Motherboard ...... 22 3-6 Pick and Place Cover...... 24 3-7 Package Installation / Removal Features...... 25 4-1 ILM Assembly with Installed Processor ...... 28 4-2 Back Plate ...... 29 4-3 Shoulder Screw...... 30 4-4 ILM Assembly ...... 31 4-5 Pin1 and ILM Lever...... 32 4-6 ILM Cover ...... 34 4-7 ILM Cover and PnP Cover Interference ...... 35 5-1 Flow Chart of Knowledge-Based Reliability Evaluation Methodology ...... 40 6-1 Thermal Test Vehicle Thermal Profile for Intel® Core™ i7-2000 and i5-2000 Desktop Processor Series (Quad Core 95W) ...... 43 6-2 Thermal Test Vehicle Thermal Profile for Intel® Core™ i7-2000 and i5-2000 Desktop Processor Series (Quad Core 65W) and Intel® Core™ i3-2000 Desktop Processor Series (Dual Core 65W) and Intel® Pentium® Processor G800 and G600 Series (Dual Core 65W) ...... 44

Thermal/Mechanical Specifications and Design Guidelines 5 6-3 Thermal Test Vehicle Thermal Profile for Intel® Core™ i5-2000 Desktop Processor Series (Quad Core 45W)...... 46 6-4 Thermal Test Vehicle Thermal Profile for Intel® Core™ i5-2000 and i3-2000 Desktop Processor Series (Dual Core 35W) and Intel® Pentium® Processor G600 Series (Dual Core 35W)...... 47 6-5 TTV Case Temperature (TCASE) Measurement Location ...... 52 6-6 Frequency and Voltage Ordering ...... 54 6-7 Package Power Control ...... 59 8-1 Comparison of Case Temperature versus Sensor Based Specification ...... 64 8-2 Intel® Core™ i7-2000 and i5-2000 Desktop Processor Series (Quad Core 95W) Thermal Profile...... 65 8-3 Thermal solution Performance ...... 66 8-4 Example: Required YCA for Various TAMBIENT Conditions ...... 68 8-5 Thermal Solution Performance versus Fan Speed ...... 69 8-6 Fan Response Without TAMBIENT Data ...... 71 8-7 Fan Response with TAMBIENT Aware FSC...... 72 8-8 DTS 1.1 Definition Points ...... 74 8-9 Fan Response Comparison with Various Fan Speed Control Options ...... 76 9-1 ATX Heatsink Reference Design Assembly ...... 80 9-2 ATX KOZ 3-D Model Primary (Top) Side ...... 81 9-3 RCBFH Extrusion ...... 82 9-4 Clip for Existing Solutions to straddle LGA1155 Socket...... 83 9-5 Core ...... 84 9-6 Clip Core and Extrusion Assembly ...... 85 9-7 Critical Parameters for Interface to the Reference Clip ...... 86 9-8 Critical Core Dimensions ...... 86 9-9 TTV Die Size and Orientation...... 87 11-1 Mechanical Representation of the Boxed Processor ...... 94 11-2 Space Requirements for the Boxed Processor (side view) ...... 95 11-3 Space Requirements for the Boxed Processor (top view) ...... 95 11-4 Space Requirements for the Boxed Processor (overall view) ...... 96 11-5 Boxed Processor Fan Heatsink Power Cable Connector Description...... 97 11-6 Baseboard Power Header Placement Relative to Processor Socket...... 98 11-7 Boxed Processor Fan Heatsink Airspace Keepout Requirements (top view)...... 99 11-8 Boxed Processor Fan Heatsink Airspace Keepout Requirements (side view)...... 99 11-9 Boxed Processor Fan Heatsink Set Points ...... 100

6 Thermal/Mechanical Specifications and Design Guidelines Tables 1-1 Reference Documents ...... 10 1-2 Terms and Descriptions...... 10 2-1 Processor Loading Specifications ...... 15 2-2 Package Handling Guidelines...... 15 2-3 Processor Materials...... 16 2-4 Storage Conditions ...... 18 5-1 Socket Component Mass ...... 37 5-2 1155-land Package and LGA1155 Socket Stackup Height ...... 37 5-3 Socket & ILM Mechanical Specifications ...... 38 5-4 Electrical Requirements for LGA1155 Socket ...... 39 6-1 Processor Thermal Specifications...... 42 6-2 Thermal Test Vehicle Thermal Profile for Intel® Core™ i7-2000 and i5-2000 Desktop Processor Series (Quad Core 95W) (Sheet 1 of 2)...... 43 6-3 Thermal Test Vehicle Thermal Profile for Intel® Core™ i7-2000 and i5-2000 Desktop Processor Series (Quad Core 65W) and Intel® Core™ i3-2000 Desktop Processor Series (Dual Core 65W) and Intel® Pentium® Processor G800 and G600 Series (Dual Core 65W) ...... 45 6-4 Thermal Test Vehicle Thermal Profile for Intel® Core™ i5-2000 Desktop Processor Series (Quad Core 45W) ...... 46 6-5 Thermal Test Vehicle Thermal Profile for Intel® Core™ i5-2000 and i3-2000 Desktop Processor Series (Dual Core 35W) and Intel® Pentium® Processor G600 Series (Dual Core 35W) ...... 47 6-6 Thermal Solution Performance above TCONTROL for the Intel® Core™ i7-2000 and i5-2000 Desktop Processor Series (Quad Core 95W) (Sheet 1 of 2)...... 48 6-7 Thermal Solution Performance above TCONTROL for the Intel® Core™ i7-2000 and i5-2000 Desktop Processor Series (Quad Core 65W) and Intel® Core™ i3-2000 Desktop Processor Series (Dual Core 65W) and Intel® Pentium® Processor G800 and G600 Series (Dual Core 65W) ...... 49 6-8 Thermal Solution Performance above TCONTROL for the Intel® Core™ i5-2000 Desktop Processor Series (Quad Core 45W) ...... 50 6-9 Thermal Solution Performance above TCONTROL for the Intel® Core™ i5-2000 and i3-2000 Desktop Processor Series (Dual Core 35W) and Intel® Pentium® Processor G600 Series (Dual Core 35W) ...... 51 8-1 DTS 1.1 Thermal Solution Performance above TCONTROL...... 74 8-2 Fan Speed control example for 95W TDP processor1 ...... 75 8-3 Thermal Solution Performance above TCONTROL ...... 77 9-1 Reference Thermal Solutions ...... 79 10-1 Use Conditions (Board Level) ...... 89 11-1 Fan Heatsink Power and Signal Specifications...... 98 11-2 Fan Heatsink Power and Signal Specifications...... 101

Thermal/Mechanical Specifications and Design Guidelines 7 Revision History

Revision Description Revision Date Number

001 • Initial release January 2011 002 • Minor edits for clarity January 2011 003 • Minor edits for clarity April 2011 004 • Added Intel® Pentium® processor family desktop May 2011

8 Thermal/Mechanical Specifications and Design Guidelines Introduction

1 Introduction

The goal of this document is to provide thermal and mechanical specifications for the processor and the associated socket. The usual design guidance is also included.

The components described in this document include: • The thermal and mechanical specifications for the following Intel® desktop processors: —Intel® Core™ i7-2000 desktop processor series —Intel® Core™ i5-2000 desktop processor series —Intel® Core™ i3-2000 desktop processor series —Intel® Pentium® processor G800 series —Intel® Pentium® processor G600 series • The LGA1155 socket and the Independent Loading Mechanism (ILM) and back plate. • The reference design thermal solution (heatsink) for the processors and associated retention hardware.

The Intel® Core™ i7-2000, i5-2000 and i3-2000 desktop processor series and Intel® Pentium® processor G800 and G600 series has the different thermal specifications. When required for clarity, this document will use: —Intel® Core™ i7-2000 and i5-2000 desktop processor series (Quad Core 95W) —Intel® Core™ i7-2000 and i5-2000 desktop processor series (Quad Core 65W) —Intel® Core™ i3-2000 desktop processor series (Dual Core 65W) and Intel® Pentium® processor G800 and G600 series (Dual Core 65W) —Intel® Core™ i5-2000 desktop processor series (Quad Core 45W) —Intel® Core™ i5-2000 and i3-2000 desktop processor series (Dual Core 35W) and Intel® Pentium® processor G600 series (Dual Core 35W)

Note: When the information is applicable to all products the this document will use “processor” or “processors” to simplify the document.

Thermal/Mechanical Specifications and Design Guidelines 9 Introduction

1.1 Reference Documents

Material and concepts available in the following documents may be beneficial when reading this document.

Table 1-1. Reference Documents

Document Location Notes

2nd Generation Intel® Core™ Processor Family Desktop and Intel® http:// Pentium® Processor Family Desktop Datasheet, Volume 1 download.intel.com/ design/processor/ datashts/324641.pdf

2nd Generation Intel® Core™ Processor Family Desktop and Intel® http:// Pentium® Processor Family Desktop Datasheet, Volume 2 download.intel.com/ design/processor/ datashts/324642.pdf

2nd Generation Intel® Core™ Processor Family Desktop and Intel® http:// Pentium® Processor Family Desktop Specification Update download.intel.com/ design/processor/ specupdt/324643.pdf

4-Wire Pulse Width Modulation (PWM) Controlled Fans Available at http:// www.formfactors.org/

1.2 Definition of Terms

Table 1-2. Terms and Descriptions

Term Description

Bypass is the area between a passive heatsink and any object that can act to form a Bypass duct. For this example, it can be expressed as a dimension away from the outside dimension of the fins to the nearest surface.

CTE Coefficient of Thermal Expansion. The relative rate a material expands during a thermal event.

DTS Digital Thermal Sensor reports a relative die temperature as an offset from TCC activation temperature. FSC Fan Speed Control

Integrated Heat Spreader: a component of the processor package used to enhance the IHS thermal performance of the package. Component thermal solutions interface with the processor at the IHS surface.

ILM Independent Loading Mechanism provides the force needed to seat the 1155-LGA land package onto the socket contacts.

PCH Platform Controller Hub. The PCH is connected to the processor using the Direct Media Interface (DMI) and Intel® Flexible Display Interface (Intel® FDI).

LGA1155 socket The processor mates with the system board through this surface mount, 1155-land socket.

The Platform Environment Control Interface (PECI) is a one-wire interface that provides PECI a communication channel between Intel processor and chipset components to external monitoring devices.

Case-to-ambient thermal characterization parameter (psi). A measure of thermal CA solution performance using total package power. Defined as (TCASE – TLA) / Total Package Power. The heat source should always be specified for  measurements. Case-to-sink thermal characterization parameter. A measure of thermal interface CS material performance using total package power. Defined as (TCASE – TS) / Total Package Power.

Sink-to-ambient thermal characterization parameter. A measure of heatsink thermal SA performance using total package power. Defined as (TS – TLA) / Total Package Power.

10 Thermal/Mechanical Specifications and Design Guidelines Introduction

Table 1-2. Terms and Descriptions (Continued)

Term Description

T or T The case temperature of the processor, measured at the geometric center of the topside CASE C of the TTV IHS.

TCASE_MAX The maximum case temperature as specified in a component specification. Thermal Control Circuit: Thermal monitor uses the TCC to reduce the die temperature by TCC using clock modulation and/or operating frequency and input voltage adjustment when the die temperature is very near its operating limits.

Tcontrol is a static value that is below the TCC activation temperature and used as a TCONTROL trigger point for fan speed control. When DTS > Tcontrol, the processor must comply to the TTV thermal profile.

TDP Thermal Design Power: Thermal solution should be designed to dissipate this target power level. TDP is not the maximum power that the processor can dissipate.

Thermal Monitor A power reduction feature designed to decrease temperature after the processor has reached its maximum operating temperature. Thermal Profile Line that defines case temperature specification of the TTV at a given power level.

Thermal Interface Material: The thermally conductive compound between the heatsink TIM and the processor case. This material fills the air gaps and voids, and enhances the transfer of the heat from the processor case to the heatsink.

TTV Thermal Test Vehicle. A mechanically equivalent package that contains a resistive heater in the die to evaluate thermal solutions.

The measured ambient temperature locally surrounding the processor. The ambient TLA temperature should be measured just upstream of a passive heatsink or at the fan inlet for an active heatsink.

T The system ambient air temperature external to a system chassis. This temperature is SA usually measured at the chassis air inlets.

Thermal/Mechanical Specifications and Design Guidelines 11 Introduction

12 Thermal/Mechanical Specifications and Design Guidelines Package Mechanical and Storage Specifications

2 Package Mechanical and Storage Specifications

2.1 Package Mechanical Specifications

The processor is packaged in a Flip-Chip Land Grid Array package that interfaces with the motherboard using the LGA1155 socket. The package consists of a processor mounted on a substrate land-carrier. An integrated heat spreader (IHS) is attached to the package substrate and core and serves as the mating surface for processor thermal solutions, such as a heatsink. Figure 2-1 shows a sketch of the processor package components and how they are assembled together. Refer to Chapter 3 and Chapter 4 for complete details on the LGA1155 socket.

The package components shown in Figure 2-1 include the following: 1. Integrated Heat Spreader (IHS) 2. Thermal Interface Material (TIM) 3. Processor core (die) 4. Package substrate 5. Capacitors

Figure 2-1. Processor Package Assembly Sketch

Core (die) TIM IHS

Substrate

Capacitors LGA1155 Socket

System Board

Note: 1. Socket and motherboard are included for reference and are not part of processor package. 2. For clarity the ILM not shown.

Thermal/Mechanical Specifications and Design Guidelines 13 Package Mechanical and Storage Specifications

2.1.1 Package Mechanical Drawing

Figure 2-2 shows the basic package layout and dimensions. The detailed package mechanical drawings are in Appendix D. The drawings include dimensions necessary to design a thermal solution for the processor. These dimensions include: 1. Package reference with tolerances (total height, length, width, and so on) 2. IHS parallelism and tilt 3. Land dimensions 4. Top-side and back-side component keep-out dimensions 5. Reference datums 6. All drawing dimensions are in mm.

Figure 2-2. Package View 37.5

37.5

2.1.2 Processor Component Keep-Out Zones

The processor may contain components on the substrate that define component keepout zone requirements. A thermal and mechanical solution design must not intrude into the required keep-out zones. Decoupling capacitors are typically mounted to either the topside or land-side of the package substrate. See Figure B-3 and Figure B-4 for keepout zones. The location and quantity of package capacitors may change due to manufacturing efficiencies but will remain within the component keep-in. This keep-in zone includes solder paste and is a post reflow maximum height for the components.

14 Thermal/Mechanical Specifications and Design Guidelines Package Mechanical and Storage Specifications

2.1.3 Package Loading Specifications

Table 2-1 provides dynamic and static load specifications for the processor package. These mechanical maximum load limits should not be exceeded during heatsink assembly, shipping conditions, or standard use condition. Also, any mechanical system or component testing should not exceed the maximum limits. The processor package substrate should not be used as a mechanical reference or load-bearing surface for thermal and mechanical solution.

Table 2-1. Processor Loading Specifications

Parameter Minimum Maximum Notes

Static Compressive Load — 600 N [135 lbf] 1, 2, 3

Dynamic Compressive Load — 712 N [160 lbf] 1, 3, 4

Notes: 1. These specifications apply to uniform compressive loading in a direction normal to the processor IHS. 2. This is the maximum static force that can be applied by the heatsink and retention solution to maintain the heatsink and processor interface. 3. These specifications are based on limited testing for design characterization. Loading limits are for the package only and do not include the limits of the processor socket. 4. Dynamic loading is defined as an 50g shock load, 2X Dynamic Acceleration Factor with a 500g maximum thermal solution.

2.1.4 Package Handling Guidelines

Table 2-2 includes a list of guidelines on package handling in terms of recommended maximum loading on the processor IHS relative to a fixed substrate. These package handling loads may be experienced during heatsink removal.

Table 2-2. Package Handling Guidelines

Parameter Maximum Recommended Notes

Shear 311 N [70 lbf] 1, 4

Tensile 111 N [25 lbf] 2, 4

Torque 3.95 N-m [35 lbf-in] 3, 4

Notes: 1. A shear load is defined as a load applied to the IHS in a direction parallel to the IHS top surface. 2. A tensile load is defined as a pulling load applied to the IHS in a direction normal to the IHS surface. 3. A torque load is defined as a twisting load applied to the IHS in an axis of rotation normal to the IHS top surface. 4. These guidelines are based on limited testing for design characterization.

2.1.5 Package Insertion Specifications

The processor can be inserted into and removed from an LGA1155 socket 15 times. The socket should meet the LGA1155 socket requirements detailed in Chapter 5.

2.1.6 Processor Mass Specification

The typical mass of the processor is 21.5g (0.76 oz). This mass [weight] includes all the components that are included in the package.

Thermal/Mechanical Specifications and Design Guidelines 15 Package Mechanical and Storage Specifications

2.1.7 Processor Materials

Table 2-3 lists some of the package components and associated materials.

Table 2-3. Processor Materials

Component Material

Integrated Heat Spreader (IHS) Nickel Plated Copper

Substrate Fiber Reinforced Resin

Substrate Lands Gold Plated Copper

2.1.8 Processor Markings

Figure 2-3 shows the topside markings on the processor. This diagram is to aid in the identification of the processor.

Figure 2-3. Processor Top-Side Markings

Sample (QDF): GRP1LINE1: i{M}{C}YY GRP1LINE2: INTEL CONFIDENTIAL GRP1LINE3: QDF ES SPEED GRP1LINE4: COUNTRY OF ORIGIN GRP1LINE1 GRP1LINE5: {FPO} {e4} GRP1LINE2 GRP1LINE3 GRP1LINE4 Production (SSPEC): GRP1LINE5 GRP1LINE1: i{M}{C}YY GRP1LINE2: BRAND PROC# GRP1LINE3: SSPEC SPEED GRP1LINE4: COUNTRY OF ORIGIN S/N GRP1LINE5: {FPO} {e4}

16 Thermal/Mechanical Specifications and Design Guidelines Package Mechanical and Storage Specifications

2.1.9 Processor Land Coordinates

Figure 2-4 shows the bottom view of the processor package.

. Figure 2-4. Processor Package Lands Coordinates

AY AW AV AU AT AR AP AN AM AL AK AJ AH AG AF AE AD AC AB AA Y W V U P R T N M K K J H G F E D C B A

1 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31 33 35 37 39 2 4 6 8 10121416182022242628303234 36 38 40

Thermal/Mechanical Specifications and Design Guidelines 17 Package Mechanical and Storage Specifications

2.2 Processor Storage Specifications

Table 2-4 includes a list of the specifications for device storage in terms of maximum and minimum temperatures and relative humidity. These conditions should not be exceeded in storage or transportation.

Table 2-4. Storage Conditions

Parameter Description Min Max Notes

TABSOLUTE STORAGE The non-operating device storage temperature. Damage (latent or otherwise) may occur when -55 °C 125 °C 1, 2, 3 subjected to for any length of time.

The ambient storage temperature limit (in TSUSTAINED STORAGE -5 °C 40 °C 4, 5 shipping media) for a sustained period of time.

The maximum device storage relative humidity RHSUSTAINED STORAGE 60% @ 24 °C 5, 6 for a sustained period of time.

A prolonged or extended period of time; typically 0 6 TIMESUSTAINED STORAGE 6 associated with customer shelf life. Months Months

Notes: 1. Refers to a component device that is not assembled in a board or socket that is not to be electrically connected to a voltage reference or I/O signals. 2. Specified temperatures are based on data collected. Exceptions for surface mount reflow are specified in by applicable JEDEC standard Non-adherence may affect processor reliability.

3. TABSOLUTE STORAGE applies to the unassembled component only and does not apply to the shipping media, moisture barrier bags or desiccant. 4. Intel branded board products are certified to meet the following temperature and humidity limits that are given as an example only (Non-Operating Temperature Limit: -40 °C to 70 °C, Humidity: 50% to 90%, non-condensing with a maximum wet bulb of 28 °C). Post board attach storage temperature limits are not specified for non-Intel branded boards. 5. The JEDEC, J-JSTD-020 moisture level rating and associated handling practices apply to all moisture sensitive devices removed from the moisture barrier bag. 6. Nominal temperature and humidity conditions and durations are given and tested within the constraints

imposed by TSUSTAINED STORAGE and customer shelf life in applicable intel box and bags. §

18 Thermal/Mechanical Specifications and Design Guidelines LGA1155 Socket

3 LGA1155 Socket

This chapter describes a surface mount, LGA (Land Grid Array) socket intended for the processors. The socket provides I/O, power and ground contacts. The socket contains 1155 contacts arrayed about a cavity in the center of the socket with lead-free solder balls for surface mounting on the motherboard.

The contacts are arranged in two opposing L-shaped patterns within the grid array. The grid array is 40 x 40 with 24 x 16 grid depopulation in the center of the array and selective depopulation elsewhere.

The socket must be compatible with the package (processor) and the Independent Loading Mechanism (ILM). The ILM design includes a back plate which is integral to having a uniform load on the socket solder joints. Socket loading specifications are listed in Chapter 5.

Figure 3-1. LGA1155 Socket with Pick and Place Cover

Thermal/Mechanical Specifications and Design Guidelines 19 LGA1155 Socket

Figure 3-2. LGA1155 Socket Contact Numbering (Top View of Socket)

40 39 38 37 36 35 34 33 32 31 30 29 28 30 27 29 26 28 25 27 26 24 25 23 24 22 23 21 22 20 19 21 18 20 17 19 18 16 15 17 14 16 15 13 14 12 13 11 12 11 10 9 8 7 6 5 4 3 2 1

A C E G J L N R U W AA AC AE AG AJ AL AN AR AU AW B D F H K M P T V Y AB AD AF AH AK AM AP AT AV AY

20 Thermal/Mechanical Specifications and Design Guidelines LGA1155 Socket

3.1 Board Layout

The land pattern for the LGA1155 socket is 36 mils X 36 mils (X by Y) within each of the two L-shaped sections. Note that there is no round-off (conversion) error between socket pitch (0.9144 mm) and board pitch (36 mil) as these values are equivalent. The two L-sections are offset by 0.9144 mm (36 mil) in the x direction and 3.114 mm (122.6 mil) in the y direction, see Figure 3-3. This was to achieve a common package land to PCB land offset which ensures a single PCB layout for socket designs from the multiple vendors.

Figure 3-3. LGA1155 Socket Land Pattern (Top View of Board)

A C E G J L N R U W AA AC AE AG AJ AL AN AR AU AW B D F H K M P T V Y AB AD AF AH AK AM AP AT AV AY

40 39 38 37 36 35 34 33 32 31 30 36mil (0.9144 mm) 29 28 30 27 29 26 28 25 27 24 26 23 25 22 24 21 23 20 22 19 21 18 20 17 19 16 18 15 17 14 16 13 15 12 14 11 13 12 122.6 mil (3.1144mm) 11 10 9 8 7 6 5 4 3 2 1 A C E G J L N R U W AA AC AE AG AJ AL AN AR AU AW B D F H K M P T V Y AB AD AF AH AK AM AP AT AV AY

Thermal/Mechanical Specifications and Design Guidelines 21 LGA1155 Socket

3.1.1 Suggested Silkscreen Marking for Socket Identification

Intel is recommending that customers mark the socket name approximately where shown in Figure 3-4.

Figure 3-4. Suggested Board Marking

3.2 Attachment to Motherboard

The socket is attached to the motherboard by 1155 solder balls. There are no additional external methods (that is, screw, extra solder, adhesive, and so on) to attach the socket.

As indicated in Figure 3-1, the Independent Loading Mechanism (ILM) is not present during the attach (reflow) process.

Figure 3-5. Attachment to Motherboard

Load plate

Frame Load Lever

Shoulder Screw

Back Plate

22 Thermal/Mechanical Specifications and Design Guidelines LGA1155 Socket

3.3 Socket Components

The socket has two main components, the socket body and Pick and Place (PnP) cover, and is delivered as a single integral assembly. Refer to Appendix C for detailed drawings.

3.3.1 Socket Body Housing

The housing material is thermoplastic or equivalent with UL 94 V-0 flame rating capable of withstanding 260 °C for 40 seconds which is compatible with typical reflow/rework profiles. The socket coefficient of thermal expansion (in the XY plane), and creep properties, must be such that the integrity of the socket is maintained for the conditions listed in Chapter 5.

The color of the housing will be dark as compared to the solder balls to provide the contrast needed for pick and place vision systems.

3.3.2 Solder Balls

A total of 1155 solder balls corresponding to the contacts are on the bottom of the socket for surface mounting with the motherboard. The socket solder ball has the following characteristics: • Lead free SAC (SnAgCu) 305 solder alloy with a silver (Ag) content between 3% and 4% and a melting temperature of approximately 217 °C. The alloy is compatible with immersion silver (ImAg) and Organic Solderability Protectant (OSP) motherboard surface finishes and a SAC alloy solder paste. • Solder ball diameter 0.6 mm ± 0.02 mm, before attaching to the socket lead.

The co-planarity (profile) and true position requirements are defined in Appendix C.

3.3.3 Contacts

Base material for the contacts is high strength copper alloy.

For the area on socket contacts where processor lands will mate, there is a 0.381 m [15 inches] minimum gold plating over 1.27 m [50 inches] minimum nickel underplate.

No contamination by solder in the contact area is allowed during solder reflow.

Thermal/Mechanical Specifications and Design Guidelines 23 LGA1155 Socket

3.3.4 Pick and Place Cover

The cover provides a planar surface for vacuum pick up used to place components in the Surface Mount Technology (SMT) manufacturing line. The cover remains on the socket during reflow to help prevent contamination during reflow. The cover can withstand 260 °C for 40 seconds (typical reflow/rework profile) and the conditions listed in Chapter 5 without degrading.

As indicated in Figure 3-6, the cover remains on the socket during ILM installation, and should remain on whenever possible to help prevent damage to the socket contacts.

Cover retention must be sufficient to support the socket weight during lifting, translation, and placement (board manufacturing), and during board and system shipping and handling. PnP Cover should only be removed with tools, to prevent the cover from falling into the contacts.

The socket vendors have a common interface on the socket body where the PnP cover attaches to the socket body. This should allow the PnP covers to be compatible between socket suppliers.

As indicated in Figure 3-6, a Pin1 indicator on the cover provides a visual reference for proper orientation with the socket.

Figure 3-6. Pick and Place Cover

Pin 1

Pick & Place Cover ILM Installation

24 Thermal/Mechanical Specifications and Design Guidelines LGA1155 Socket

3.4 Package Installation / Removal

As indicated in Figure 3-7, access is provided to facilitate manual installation and removal of the package.

To assist in package orientation and alignment with the socket: • The package Pin1 triangle and the socket Pin1 chamfer provide visual reference for proper orientation. • The package substrate has orientation notches along two opposing edges of the package, offset from the centerline. The socket has two corresponding orientation posts to physically prevent mis-orientation of the package. These orientation features also provide initial rough alignment of package to socket. • The socket has alignment walls at the four corners to provide final alignment of the package.

. Figure 3-7. Package Installation / Removal Features

Package Orientation Pin 1 Notch Indicator (2 Places)

Finger/Tool Access Alignment (2 Places) Post Pin 1 (2 Places) Chamfer

3.4.1 Socket Standoffs and Package Seating Plane

Standoffs on the bottom of the socket base establish the minimum socket height after solder reflow and are specified in Appendix C.

Similarly, a seating plane on the topside of the socket establishes the minimum package height. See Section 5.2 for the calculated IHS height above the motherboard.

Thermal/Mechanical Specifications and Design Guidelines 25 LGA1155 Socket

3.5 Durability

The socket must withstand 20 cycles of processor insertion and removal. The max chain contact resistance from Table 5-4 must be met when mated in the 1st and 20th cycles.

The socket Pick and Place cover must withstand 15 cycles of insertion and removal.

3.6 Markings

There are three markings on the socket: • LGA1155: Font type is Helvetica Bold - minimum 6 point (2.125 mm). This mark will also appear on the pick and place cap. • Manufacturer's insignia (font size at supplier's discretion). • Lot identification code (allows traceability of manufacturing date and location).

All markings must withstand 260 °C for 40 seconds (typical reflow/rework profile) without degrading, and must be visible after the socket is mounted on the motherboard.

LGA1155 and the manufacturer's insignia are molded or laser marked on the side wall.

3.7 Component Insertion Forces

Any actuation must meet or exceed SEMI S8-95 Safety Guidelines for Ergonomics/ Human Factors Engineering of Semiconductor Manufacturing Equipment, example Table R2-7 (Maximum Grip Forces). The socket must be designed so that it requires no force to insert the package into the socket.

3.8 Socket Size

Socket information needed for motherboard design is given in Appendix C.

This information should be used in conjunction with the reference motherboard keepout drawings provided in Appendix B to ensure compatibility with the reference thermal mechanical components.

26 Thermal/Mechanical Specifications and Design Guidelines Independent Loading Mechanism (ILM)

4 Independent Loading Mechanism (ILM)

The ILM has two critical functions: deliver the force to seat the processor onto the socket contacts and distribute the resulting compressive load evenly through the socket solder joints.

The mechanical design of the ILM is integral to the overall functionality of the LGA1155 socket. Intel performs detailed studies on integration of processor package, socket and ILM as a system. These studies directly impact the design of the ILM. The Intel reference ILM will be “build to print” from Intel controlled drawings. Intel recommends using the Intel Reference ILM. Custom non-Intel ILM designs do not benefit from Intel's detailed studies and may not incorporate critical design parameters.

Note: There is a single ILM design for the LGA1155 socket and LGA1156 socket.

4.1 Design Concept

The ILM consists of two assemblies that will be procured as a set from the enabled vendors. These two components are ILM assembly and back plate. To secure the two assemblies, two types of fasteners are required a pair (2) of standard 6-32 thread screws and a custom 6-32 thread shoulder screw. The reference design incorporates a T-20 Torx* head fastener. The Torx* head fastener was chosen to ensure end users do not inadvertently remove the ILM assembly and for consistency with the LGA1366 socket ILM. The Torx* head fastener is also less susceptible to driver slippage. Once assembled the ILM is not required to be removed to install / remove the motherboard from a chassis.

4.1.1 ILM Assembly Design Overview

The ILM assembly consists of 4 major pieces: ILM cover, load lever, load plate and the hinge frame assembly.

All of the pieces in the ILM assembly except the hinge frame and the screws used to attach the back plate are fabricated from stainless steel. The hinge frame is plated. The frame provides the hinge locations for the load lever and load plate. An insulator is pre- applied to the bottom surface of the hinge frame.

The ILM assembly design ensures that once assembled to the back plate the only features touching the board are the shoulder screw and the insulated hinge frame assembly. The nominal gap of the load plate to the board is ~1 mm.

When closed the load plate applies two point loads onto the IHS at the “dimpled” features shown in Figure 4-1. The reaction force from closing the load plate is transmitted to the hinge frame assembly and through the fasteners to the back plate. Some of the load is passed through the socket body to the board inducing a slight compression on the solder joints.

A pin 1 indicator will be marked on the ILM assembly.

Thermal/Mechanical Specifications and Design Guidelines 27 Independent Loading Mechanism (ILM)

Figure 4-1. ILM Assembly with Installed Processor

Hinge / Frame Assy Fasteners

Load Load Lever Plate

Pin 1 Indicator Shoulder Screw

4.1.2 ILM Back Plate Design Overview

The back plate is a flat steel back plate with pierced and extruded features for ILM attach. A clearance hole is located at the center of the plate to allow access to test points and backside capacitors if required. An insulator is pre-applied. A notch is placed in one corner to assist in orienting the back plate during assembly.

Caution: Intel does NOT recommend using the server back plate for high-volume desktop applications at this time as the server back plate test conditions cover a limited envelope. Back plates and screws are similar in appearance. To prevent mixing, different levels of differentiation between server and desktop back plate and screws have been implemented.

For ILM back plate, three levels of differentiation have been implemented: • Unique part numbers, please refer to part numbers listed in Appendix A. • Desktop ILM back plate to use black lettering for marking versus server ILM back plate to use yellow lettering for marking. • Desktop ILM back plate using marking “115XDBP” versus server ILM back plate using marking “115XSBP”.

Note: When reworking a BGA component or the socket that the heatsink, battery, ILM and ILM Back Plate are removed prior to rework. The ILM back plate should also be removed when reworking through hole mounted components in a mini-wave or solder pot). The maximum temperature for the pre-applied insulator on the ILM is approximately 106 °C.

28 Thermal/Mechanical Specifications and Design Guidelines Independent Loading Mechanism (ILM)

Figure 4-2. Back Plate

Assembly Die Cut Orientation Insulator Feature

Pierced & Extruded Thread Features

4.1.3 Shoulder Screw and Fasteners Design Overview

The shoulder screw is fabricated from carbonized steel rod. The shoulder height and diameter are integral to the mechanical performance of the ILM. The diameter provides alignment of the load plate. The height of the shoulder ensures the proper loading of the IHS to seat the processor on the socket contacts. The design assumes the shoulder screw has a minimum yield strength of 235 MPa.

A dimensioned drawing of the shoulder screw is available for local sourcing of this component. Please refer to Figure B-13 for the custom 6-32 thread shoulder screw drawing.

The standard fasteners can be sourced locally. The design assumes this fastener has a minimum yield strength of 235 MPa. Please refer to Figure B-14 for the standard 6-32 thread fasteners drawing.

Note: The screws for Server ILM are different from Desktop design. The length of Server ILM screws are shorter than the Desktop screw length to satisfy Server secondary-side clearance limitation.

Note: Unique part numbers, please refer to Appendix A.

Note: The reference design incorporates a T-20 Torx* head fastener. The Torx* head fastener was chosen to ensure end users do not inadvertently remove the ILM assembly and for consistency with the LGA1366 socket ILM.

Thermal/Mechanical Specifications and Design Guidelines 29 Independent Loading Mechanism (ILM)

Figure 4-3. Shoulder Screw

Cap

6-32 thread

Shoulder

4.2 Assembly of ILM to a Motherboard

The ILM design allows a bottoms up assembly of the components to the board. See Figure 4-4 for step by step assembly sequence. 1. Place the back plate in a fixture. The motherboard is aligned with the fixture. 2. Install the shoulder screw in the single hole near Pin 1 of the socket. Torque to a minimum and recommended 8 inch-pounds, but not to exceed 10 inch-pounds. 3. Align and place the ILM assembly over the socket. 4. Install two (2) 6-32 fasteners. Torque to a minimum and recommended 8 inch- pounds, but not to exceed 10 inch-pounds.

The thread length of the shoulder screw accommodates a nominal board thicknesses of 0.062”.

30 Thermal/Mechanical Specifications and Design Guidelines Independent Loading Mechanism (ILM)

. Figure 4-4. ILM Assembly

Step 1 Step 2

Step 3 Step 4

As indicated in Figure 4-5, the shoulder screw, socket protrusion and ILM key features prevent 180 degree rotation of ILM cover assembly with respect to socket. The result is a specific Pin 1 orientation with respect to ILM lever.

Thermal/Mechanical Specifications and Design Guidelines 31 Independent Loading Mechanism (ILM)

Figure 4-5. Pin1 and ILM Lever

Alignment Features

Pin 1

Shoulder Screw Load plate not shown for clarity Load Lever

4.3 ILM Interchangeability

ILM assembly and ILM back plate built from the Intel controlled drawings are intended to be interchangeable. Interchangeability is defined as an ILM from Vendor A will demonstrate acceptable manufacturability and reliability with a socket body from Vendor A, B or C. ILM assembly and ILM back plate from all vendors are also interchangeable.

The ILM are an integral part of the socket validation testing. ILMs from each vendor will be matrix tested with the socket bodies from each of the current vendors. The tests would include: manufacturability, bake and thermal cycling.

See Appendix A for vendor part numbers that were tested.

Note: ILMs that are not compliant to the Intel controlled ILM drawings can not be assured to be interchangeable.

4.4 Markings

There are four markings on the ILM: • 115XLM: Font type is Helvetica Bold - minimum 6 point (2.125 mm). • Manufacturer's insignia (font size at supplier's discretion). • Lot identification code (allows traceability of manufacturing date and location). • Pin 1 indicator on the load plate.

All markings must be visible after the ILM is assembled on the motherboard.

115XLM and the manufacturer's insignia can be ink stamped or laser marked on the side wall.

32 Thermal/Mechanical Specifications and Design Guidelines Independent Loading Mechanism (ILM)

4.5 ILM Cover

Intel has developed an ILM Cover that will snap onto the ILM for the LGA115x socket family. The ILM cover is intended to reduce the potential for socket contact damage from operator and customer fingers being close to the socket contacts to remove or install the pick and place cap. The ILM Cover concept is shown in Figure 4-6.

The ILM Cover is intended to be used in place of the pick and place cover once the ILM is assembled to the motherboard. The ILM will be offered with the ILM Cover pre assembled as well as offered as a discrete component.

ILM Cover features: • Pre-assembled by the ILM vendors to the ILM load plate. It will also be offered as a discrete component. • The ILM cover will pop off if a processor is installed in the socket, and the ILM Cover and ILM are from the same manufacturer. • ILM Cover can be installed while the ILM is open. • Maintain inter-changeability between validated ILM vendors for LGA115x socket, with the exception noted below1. • The ILM cover for the LGA115x socket will have a flammability rating of V-2 per UL 60950-1.

Note: The ILM Cover pop off feature is not supported if the ILM Covers are interchanged on different vendor’s ILMs.

Thermal/Mechanical Specifications and Design Guidelines 33 Independent Loading Mechanism (ILM)

Figure 4-6. ILM Cover

Step 1: PnP Cover installed during ILM assembly Step 2: Remove PnP Cover

Step 3: Close ILM

As indicated in Figure 4-6, the pick and place cover should remain installed during ILM assembly to the motherboard. After assembly, the pick and place cover is removed, the ILM Cover installed and the ILM mechanism closed. The ILM Cover is designed to pop off if the pick and place cover is accidentally left in place and the ILM closed with the ILM Cover installed. This is shown in Figure 4-7.

34 Thermal/Mechanical Specifications and Design Guidelines Independent Loading Mechanism (ILM)

Figure 4-7. ILM Cover and PnP Cover Interference

As indicated in Figure 4-7, the pick and place cover cannot remain in place and used in conjunction with the ILM Cover. The ILM Cover is designed to interfere and pop off if the pick and place cover is unintentionally left in place. The ILM cover will also interfere and pop off if the ILM is closed with a processor in place in the socket.

Thermal/Mechanical Specifications and Design Guidelines 35 Independent Loading Mechanism (ILM)

36 Thermal/Mechanical Specifications and Design Guidelines LGA1155 Socket and ILM Electrical, Mechanical and Environmental Specifications

5 LGA1155 Socket and ILM Electrical, Mechanical and Environmental Specifications

This chapter describes the electrical, mechanical and environmental specifications for the LGA1155 socket and the Independent Loading Mechanism.

5.1 Component Mass

Table 5-1. Socket Component Mass

Component Mass

Socket Body, Contacts and PnP Cover 10 g

ILM Cover 29 g

ILM Back Plate 38 g

5.2 Package/Socket Stackup Height

Table 5-2 provides the stackup height of a processor in the 1155-land LGA package and LGA1155 socket with the ILM closed and the processor fully seated in the socket.

Table 5-2. 1155-land Package and LGA1155 Socket Stackup Height

Component Stackup Height Note

Integrated Stackup Height (mm) 7.781 ± 0.335 mm 2 From Top of Board to Top of IHS

Socket Nominal Seating Plane Height 3.4 ± 0.2 mm 1

Package Nominal Thickness (lands to top of IHS) 4.381 ± 0.269 mm 1

Notes: 1. This data is provided for information only, and should be derived from: (a) the height of the socket seating plane above the motherboard after reflow, given in Appendix C, (b) the height of the package, from the package seating plane to the top of the IHS, and accounting for its nominal variation and tolerances that are given in the corresponding processor data sheet. 2. The integrated stackup height value is a RSS calculation based on current and planned processors that will use the ILM design.

Thermal/Mechanical Specifications and Design Guidelines 37 LGA1155 Socket and ILM Electrical, Mechanical and Environmental Specifications

5.3 Loading Specifications

The socket will be tested against the conditions listed in Chapter 10 with heatsink and the ILM attached, under the loading conditions outlined in this section.

Table 5-3 provides load specifications for the LGA1155 socket with the ILM installed. The maximum limits should not be exceeded during heatsink assembly, shipping conditions, or standard use condition. Exceeding these limits during test may result in component failure. The socket body should not be used as a mechanical reference or load-bearing surface for thermal solutions.

Table 5-3. Socket & ILM Mechanical Specifications

Parameter Min Max Notes

ILM static compressive load on processor IHS 311 N [70 lbf] 600 N [135 lbf] 3, 4, 7, 8

Heatsink static compressive load 0 N [0 lbf] 222 N [50 lbf] 1, 2, 3

Total static compressive Load 311 N [70 lbf] 822 N [185 lbf] 3, 4, 7, 8 (ILM plus Heatsink)

Dynamic Compressive Load N/A 712 N [160 lbf] 1, 3, 5, 6 (with heatsink installed)

Pick & Place cover insertion force N/A 10.2 N [2.3 lbf] -

Pick & Place cover removal force 2.2N [0.5 lbf] 7.56 N [1.7 lbf] 9

20.9 N [4.7 lbf] in the vertical direction Load lever actuation force N/A - 10.2 N [2.3 lbf] in the lateral direction.

Maximum heatsink mass N/A 500g 10

Notes: 1. These specifications apply to uniform compressive loading in a direction perpendicular to the IHS top surface. 2. This is the minimum and maximum static force that can be applied by the heatsink and it’s retention solution to maintain the heatsink to IHS interface. This does not imply the Intel reference TIM is validated to these limits. 3. Loading limits are for the LGA1155 socket. 4. This minimum limit defines the static compressive force required to electrically seat the processor onto the socket contacts. The minimum load is a beginning of life load. 5. Dynamic loading is defined as a load a 4.3 m/s [170 in/s] minimum velocity change average load superimposed on the static load requirement. 6. Test condition used a heatsink mass of 500gm [1.102 lb.] with 50 g acceleration (table input) and an assumed 2X Dynamic Acceleration Factor (DAF). The dynamic portion of this specification in the product application can have flexibility in specific values. The ultimate product of mass times acceleration plus static heatsink load should not exceed this limit. 7. The maximum BOL value and must not be exceeded at any point in the product life. 8. The minimum value is a beginning of life loading requirement based on load degradation over time. 9. The maximum removal force is the flick up removal upwards thumb force (measured at 45o), not applicable to SMT operation for system assembly. Only the minimum removal force is applicable to vertical removal in SMT operation for system assembly. 10. The maximum heatsink mass includes the core, extrusion, fan and fasteners. This mass limit is evaluated using the POR heatsink attach to the PCB.

38 Thermal/Mechanical Specifications and Design Guidelines LGA1155 Socket and ILM Electrical, Mechanical and Environmental Specifications

5.4 Electrical Requirements

LGA1155 socket electrical requirements are measured from the socket-seating plane of the processor to the component side of the socket PCB to which it is attached. All specifications are maximum values (unless otherwise stated) for a single socket contact, but includes effects of adjacent contacts where indicated.

Table 5-4. Electrical Requirements for LGA1155 Socket

Parameter Value Comment

The inductance calculated for two contacts, considering one forward conductor and one Mated loop inductance, Loop <3.6nH return conductor. These values must be satisfied at the worst-case height of the socket.

The socket average contact resistance target is calculated from the following equation: sum (Ni X LLCRi) / sum (Ni) • LLCRi is the chain resistance defined as the resistance of each chain minus resistance of Socket Average Contact Resistance shorting bars divided by number of lands in 19 mOhm (EOL) the daisy chain. • Ni is the number of contacts within a chain. • I is the number of daisy chain, ranging from 1 to 119 (total number of daisy chains). The specification listed is at room temperature and has to be satisfied at all time.

The specification listed is at room temperature and has to be satisfied at all time. Max Individual Contact Resistance 100 mOhm (EOL) Socket Contact Resistance: The resistance of the socket contact, solderball, and interface resistance to the interposer land; gaps included.

The bulk resistance increase per contact from Bulk Resistance Increase  3 m 25°C to 100°C.

Dielectric Withstand Voltage 360 Volts RMS

Insulation Resistance 800 M

Thermal/Mechanical Specifications and Design Guidelines 39 LGA1155 Socket and ILM Electrical, Mechanical and Environmental Specifications

5.5 Environmental Requirements

Design, including materials, shall be consistent with the manufacture of units that meet the following environmental reference points.

The reliability targets in this section are based on the expected field use environment for these products. The test sequence for new sockets will be developed using the knowledge-based reliability evaluation methodology, which is acceleration factor dependent. A simplified process flow of this methodology can be seen in Figure 5-1.

Figure 5-1. Flow Chart of Knowledge-Based Reliability Evaluation Methodology

Establish the Develop Speculative market/expected use stress conditions based on environment for the historical data, content technology experts, and literature search

Freeze stressing Perform stressing to requirements and perform validate accelerated additional data turns stressing assumptions and determine acceleration factors

A detailed description of this methodology can be found at: ftp://download.intel.com/ technology/itj/q32000/pdf/reliability.pdf.

40 Thermal/Mechanical Specifications and Design Guidelines Thermal Specifications

6 Thermal Specifications

The processor requires a thermal solution to maintain temperatures within its operating limits. Any attempt to operate the processor outside these operating limits may result in permanent damage to the processor and potentially other components within the system. Maintaining the proper thermal environment is key to reliable, long-term system operation.

A complete solution includes both component and system level thermal management features. Component level thermal solutions can include active or passive heatsinks attached to the processor integrated heat spreader (IHS).

This chapter provides data necessary for developing a complete thermal solution. For more information on an ATX reference thermal solution design, please refer to Chapter 9.

6.1 Thermal Specifications

To allow the optimal operation and long-term reliability of Intel processor-based systems, the processor must remain within the minimum and maximum case temperature (TCASE) specifications as defined by the applicable thermal profile. Thermal solutions not designed to provide this level of thermal capability may affect the long-term reliability of the processor and system. For more details on thermal solution design, please refer to the Chapter 9.

The processors implement a methodology for managing processor temperatures which is intended to support acoustic noise reduction through fan speed control and to assure processor reliability. Selection of the appropriate fan speed is based on the relative temperature data reported by the processor’s Digital Temperature Sensor (DTS). The DTS can be read using the Platform Environment Control Interface (PECI) as described in Chapter 7. Alternatively, when PECI is monitored by the PCH, the processor temperature can be read from the PCH using the SMBUS protocol defined in Embedded Controller Support Provided by Platform Controller Hub (PCH). The temperature reported over PECI is always a negative value and represents a delta below the onset of thermal control circuit (TCC) activation, as indicated by PROCHOT# (see Section 6.2, Processor Thermal Features). Systems that implement fan speed control must be designed to use this data. Systems that do not alter the fan speed only need to ensure the case temperature meets the thermal profile specifications.

A single integer change in the PECI value corresponds to approximately 1 °C change in processor temperature. Although each processors DTS is factory calibrated, the accuracy of the DTS will vary from part to part and may also vary slightly with temperature and voltage. In general, each integer change in PECI should equal a temperature change between 0.9 °C and 1.1 °C.

Analysis indicates that real applications are unlikely to cause the processor to consume maximum power dissipation for sustained time periods. Intel recommends that complete thermal solution designs target the Thermal Design Power (TDP), instead of the maximum processor power consumption. The Adaptive Thermal Monitor feature is intended to help protect the processor in the event that an application exceeds the TDP recommendation for a sustained time period. For more details on this feature, refer to

Thermal/Mechanical Specifications and Design Guidelines 45 Thermal Specifications

Section 6.2. To ensure maximum flexibility for future processors, systems should be designed to the Thermal Solution Capability guidelines, even if a processor with lower power dissipation is currently planned.

Table 6-1. Processor Thermal Specifications

Max Max Max TTV Maximum Power Power Power Thermal Min T TTV Product Package Package Package Design CASE (°C) TCASE C1E C3 C6 Power (°C) (W)1,2,6 (W)1,2,6 (W)1,3,6 (W)4,5,7

Intel® Core™ i7-2000 and Figure 6-1 i5-2000 desktop processor 28 22 5.5 95 & Table 6-2 series (Quad Core 95W)

Intel® Core™ i7-2000 and i5-2000 desktop processor 25 18 5.5 series (Quad Core 65W)

Intel® Core™ i3-2000 Figure 6-2 desktop processor series 65 & Table 6-3 (Dual Core 65W) and Intel® 20 12 5 Pentium® processor G800 5 and G600 series (Dual Core 65W)

Intel® Core™ i5-2000 Figure 6-3 desktop processor series 20 12 5.5 45 & Table 6-4 (Quad Core 45W)

Intel® Core™ i5-2000 and i3-2000 desktop processor Figure 6-4 series (Dual Core 35W) and 18 10 5 35 & Table 6-5 Intel® Pentium® processor G600 series (Dual Core 35W)

Notes: 1. The package C-state power is the worst case power in the system configured as follows: - Memory configured for DDR3 1333 and populated with 2 DIMM per channel. - DMI and PCIe links are at L1. 2. Specification at Tj of 50 °C and minimum voltage loadline. 3. Specification at Tj of 35 °C and minimum voltage loadline. 4. These values are specified at VCC_MAX and VNOM for all other voltage rails for all processor frequencies. Systems must be designed to ensure the processor is not to be subjected to any static VCC and ICC combination wherein VCCP exceeds VCCP_MAX at specified ICCP. Please refer to the loadline specifications in the 2nd Generation Intel® Core™ Processor Family Desktop Datasheet, Volume 1. 5. Thermal Design Power (TDP) should be used for processor thermal solution design targets. TDP is not the maximum power that the processor can dissipate. TDP is measured at DTS = -1. TDP is achieved with the Memory configured for DDR3 1333 and 2 DIMMs per channel. 6. Specified by design characterization. 7. When the Multi-monitor feature is enabled (running 4 displays simultaneously) there could be corner cases with additional system thermal impact on the SA and VCCP rails ≤1.5W (maximum of 1.5W measured on 16 lane PCIe card). The integrator should perform additional thermal validation with Multi-monitor enabled to ensure thermal compliance.

44 Thermal/Mechanical Specifications and Design Guidelines Thermal Specifications

6.1.1 Intel® Core™ i7-2000 and i5-2000 Desktop Processor Series (Quad Core 95W) Thermal Profile

Figure 6-1. Thermal Test Vehicle Thermal Profile for Intel® Core™ i7-2000 and i5-2000 Desktop Processor Series (Quad Core 95W)

Notes: 1. Please refer to Table 6-2 for discrete points that constitute the thermal profile. 2. Refer to Chapter 9 and Chapter 10 for system and environmental implementation details.

Table 6-2. Thermal Test Vehicle Thermal Profile for Intel® Core™ i7-2000 and i5-2000 Desktop Processor Series (Quad Core 95W) (Sheet 1 of 2)

Power (W) TCASE_MAX (C) Power (W) TCASE_MAX (C)

0 45.1 50 59.6

2 45.7 52 60.2

4 46.3 54 60.8

6 46.8 56 61.3

8 47.4 58 61.9

10 48.0 60 62.5

12 48.6 62 63.1

14 49.2 64 63.7

16 49.7 66 64.2

18 50.3 68 64.8

20 50.9 70 65.4

Thermal/Mechanical Specifications and Design Guidelines 45 Thermal Specifications

Table 6-2. Thermal Test Vehicle Thermal Profile for Intel® Core™ i7-2000 and i5-2000 Desktop Processor Series (Quad Core 95W) (Sheet 1 of 2)

Power (W) TCASE_MAX (C) Power (W) TCASE_MAX (C)

22 51.5 72 66.0

24 52.1 74 66.6

26 52.6 76 67.1

28 53.2 78 67.7

30 53.8 80 68.3

32 54.4 82 68.9

34 55.0 84 69.5

36 55.5 86 70.0

38 56.1 88 70.6

40 56.7 90 71.2

42 57.3 92 71.8

44 57.9 94 72.4

46 58.4 95 72.6

48 59.0

6.1.2 Intel® Core™ i7-2000 and i5-2000 Desktop Processor Series (Quad Core 65W) and Intel® Core™ i3-2000 Desktop Processor Series (Dual Core 65W) , and Intel® Pentium® Processor G800 and G600 Series (Dual Core 65W) Thermal Profile

Figure 6-2. Thermal Test Vehicle Thermal Profile for Intel® Core™ i7-2000 and i5-2000 Desktop Processor Series (Quad Core 65W) and Intel® Core™ i3-2000 Desktop Processor Series (Dual Core 65W) and Intel® Pentium® Processor G800 and G600 Series (Dual Core 65W)

44 Thermal/Mechanical Specifications and Design Guidelines Thermal Specifications

Notes: 1. Refer to Table 6-3 for discrete points that constitute the thermal profile. 2. Refer to Chapter 9 and Chapter 10 for system and environmental implementation details.

Table 6-3. Thermal Test Vehicle Thermal Profile for Intel® Core™ i7-2000 and i5-2000 Desktop Processor Series (Quad Core 65W) and Intel® Core™ i3-2000 Desktop Processor Series (Dual Core 65W) and Intel® Pentium® Processor G800 and G600 Series (Dual Core 65W)

Power (W) TCASE_MAX (C) Power (W) TCASE_MAX (C)

0 44.4 34 57.3

2 45.2 36 58.1

4 45.9 38 58.8

6 46.7 40 59.6

8 47.4 42 60.4

10 48.2 44 61.1

12 49.0 46 61.9

14 49.7 48 62.6

16 50.5 50 63.4

18 51.2 52 64.2

20 52.0 54 64.9

22 52.8 56 65.7

24 53.5 58 66.4

26 54.3 60 67.2

28 55.0 62 68.0

30 55.8 64 68.7

32 56.6 65 69.1

34 57.3 0 0

Thermal/Mechanical Specifications and Design Guidelines 45 Thermal Specifications

6.1.3 Intel® Core™ i5-2000 desktop Processor Series (Quad Core 45W) Thermal Profile

Figure 6-3. Thermal Test Vehicle Thermal Profile for Intel® Core™ i5-2000 Desktop Processor Series (Quad Core 45W)

Notes: 1. Please refer to Table 6-4 for discrete points that constitute the thermal profile. 2. Refer to Chapter 9 and Chapter 10 for system and environmental implementation details.

Table 6-4. Thermal Test Vehicle Thermal Profile for Intel® Core™ i5-2000 Desktop Processor Series (Quad Core 45W)

Power (W) TCASE_MAX (C) Power (W) TCASE_MAX (C)

0 48.2 24 59.7

2 49.2 26 60.7

4 50.1 28 61.6

6 51.1 30 62.6

8 52.0 32 63.6

10 53.0 34 64.5

12 54.09 36 65.5

14 54.9 38 66.4

16 55.9 40 67.4

18 56.8 42 68.4

20 57.8 44 69.3

22 58.8 45 69.8

44 Thermal/Mechanical Specifications and Design Guidelines Thermal Specifications

6.1.4 Intel® Core™ i5-2000 and i3-2000 Desktop Processor Series (Dual Core 35W) and Intel® Pentium® Processor G600 Series (Dual Core 35W) Thermal Profile

Figure 6-4. Thermal Test Vehicle Thermal Profile for Intel® Core™ i5-2000 and i3-2000 Desktop Processor Series (Dual Core 35W) and Intel® Pentium® Processor G600 Series (Dual Core 35W)

Notes: 1. Please refer to Table 6-5 for discrete points that constitute the thermal profile. 2. Refer to Chapter 9 and Chapter 10 for system and environmental implementation details.

Table 6-5. Thermal Test Vehicle Thermal Profile for Intel® Core™ i5-2000 and i3-2000 Desktop Processor Series (Dual Core 35W) and Intel® Pentium® Processor G600 Series (Dual Core 35W)

Power (W) TCASE_MAX (C) Power (W) TCASE_MAX (C)

0 48.2 20 57.8

2 49.2 22 58.8

4 50.1 24 59.7

6 51.1 26 60.7

8 52.0 28 61.6

10 53.0 30 62.6

12 54.0 32 63.6

14 54.9 34 64.5

16 55.9 35 65.0

18 56.8

Thermal/Mechanical Specifications and Design Guidelines 45 Thermal Specifications

6.1.5 Processor Specification for Operation Where Digital Thermal Sensor Exceeds TCONTROL

When the DTS value is less than TCONTROL the fan speed control algorithm can reduce the speed of the thermal solution fan. This remains the same as with the previous guidance for fan speed control.

During operation, when the DTS value is greater than TCONTROL, the fan speed control algorithm must drive the fan speed to meet or exceed the target thermal solution ® performance (CA) shown in Table 6-6 for the Intel Core™ i7-2000 and i5-2000 desktop processor series (Quad Core 95W), Table 6-7 for the Intel® Core™ i7-2000 and i5-2000 desktop processor series (Quad Core 65W) and Intel® Pentium® processor G800 and G600 series (Dual Core 65W), Table 6-8 for the Intel® Core™ i5-2000 desktop processor series (Quad Core 45W) and Table 6-9 for the Intel® Core™ i5-2000 and i3-2000 desktop processor series (Dual Core 35W) and Intel® Pentium® processor G600 series (Dual Core 35W). To get the full acoustic benefit of the DTS specification, ambient temperature monitoring is necessary. See Chapter 8 for details on characterizing the fan speed to CA and ambient temperature measurement.

® Table 6-6. Thermal Solution Performance above TCONTROL for the Intel Core™ i7-2000 and i5-2000 Desktop Processor Series (Quad Core 95W) (Sheet 1 of 2)

1 CA at CA at TAMBIENT 2 3 DTS = TCONTROL DTS = -1

45.1 0.290 0.289

44.0 0.310 0.301

43.0 0.328 0.312

42.0 0.346 0.322

41.0 0.364 0.333

40.0 0.383 0.343

39.0 0.401 0.354

38.0 0.419 0.364

37.0 0.437 0.375

36.0 0.455 0.385

35.0 0.473 0.396

34.0 0.491 0.406

33.0 0.510 0.417

32.0 0.528 0.427

31.0 0.546 0.438

30.0 0.564 0.448

29.0 0.582 0.459

28.0 0.600 0.469

27.0 0.618 0.480

26.0 0.637 0.491

25.0 0.655 0.501

24.0 0.673 0.512

23.0 0.691 0.522

44 Thermal/Mechanical Specifications and Design Guidelines Thermal Specifications

® Table 6-6. Thermal Solution Performance above TCONTROL for the Intel Core™ i7-2000 and i5-2000 Desktop Processor Series (Quad Core 95W) (Sheet 1 of 2)

1 CA at CA at TAMBIENT 2 3 DTS = TCONTROL DTS = -1

22.0 0.709 0.533

21.0 0.727 0.543

20.0 0.746 0.554

Notes: 1. The ambient temperature is measured at the inlet to the processor thermal solution. 2. This column can be expressed as a function of TAMBIENT by the following equation: YCA = 0.29 + (45.1 - TAMBIENT) x 0.0181 3. This column can be expressed as a function of TAMBIENT by the following equation: YCA = 0.29 + (45.1 - TAMBIENT) x 0.0105 ® Table 6-7. Thermal Solution Performance above TCONTROL for the Intel Core™ i7-2000 and i5-2000 Desktop Processor Series (Quad Core 65W) and Intel® Core™ i3-2000 Desktop Processor Series (Dual Core 65W) and Intel® Pentium® Processor G800 and G600 Series (Dual Core 65W)

1 CA at CA at TAMBIENT 2 3 DTS = TCONTROL DTS = -1 44.4 0.380 0.380 43.0 0.417 0.402 42.0 0.443 0.417 41.0 0.469 0.432 40.0 0.495 0.448 39.0 0.521 0.463 38.0 0.547 0.478 37.0 0.573 0.494 36.0 0.599 0.509 35.0 0.625 0.525 34.0 0.651 0.540 33.0 0.677 0.555 32.0 0.703 0.571 31.0 0.729 0.586 30.0 0.755 0.602 29.0 0.782 0.617 28.0 0.808 0.632 27.0 0.834 0.648 26.0 0.860 0.663 25.0 0.886 0.678 24.0 0.912 0.694 23.0 0.938 0.709 22.0 0.964 0.725 21.0 0.990 0.740 20.0 1.016 0.755 19.0 1.042 0.771 Notes: 1. The ambient temperature is measured at the inlet to the processor thermal solution. 2. This column can be expressed as a function of TAMBIENT by the following equation: YCA = 0.38 + (44.4 - TAMBIENT) x 0.0261 3. This column can be expressed as a function of TAMBIENT by the following equation: YCA = 0.38 + (44.4 - TAMBIENT) x 0.015

Thermal/Mechanical Specifications and Design Guidelines 45 Thermal Specifications

® Table 6-8. Thermal Solution Performance above TCONTROL for the Intel Core™ i5-2000 Desktop Processor Series (Quad Core 45W)

1 CA at CA at TAMBIENT 2 3 DTS = TCONTROL DTS = -1

48.2 0.480 0.480

47.0 0.525 0.507

46.0 0.563 0.529

45.0 0.601 0.551

44.0 0.638 0.573

43.0 0.676 0.596

42.0 0.714 0.618

41.0 0.751 0.640

40.0 0.789 0.662

39.0 0.827 0.684

38.0 0.864 0.707

37.0 0.902 0.729

36.0 0.940 0.751

35.0 0.977 0.773

34.0 1.015 0.796

33.0 1.053 0.818

32.0 1.090 0.840

31.0 1.128 0.862

30.0 1.165 0.884

29.0 1.203 0.907

28.0 1.241 0.929

27.0 1.278 0.951

26.0 1.316 0.973

25.0 1.354 0.996

24.0 1.391 1.018

23.0 1.429 1.040

44 Thermal/Mechanical Specifications and Design Guidelines Thermal Specifications

® Table 6-9. Thermal Solution Performance above TCONTROL for the Intel Core™ i5-2000 and i3-2000 Desktop Processor Series (Dual Core 35W) and Intel® Pentium® Processor G600 Series (Dual Core 35W)

1 CA at CA at TAMBIENT 2 3 DTS = TCONTROL DTS = -1

48.2 0.480 0.480

47.0 0.538 0.514

46.0 0.587 0.543

45.0 0.635 0.571

44.0 0.683 0.600

43.0 0.732 0.629

42.0 0.780 0.657

41.0 0.829 0.686

40.0 0.877 0.714

39.0 0.926 0.743

38.0 0.974 0.771

37.0 1.022 0.800

36.0 1.071 0.829

35.0 1.119 0.857

34.0 1.168 0.886

33.0 1.216 0.914

32.0 1.265 0.943

31.0 1.313 0.971

30.0 1.361 1.000

29.0 1.410 1.029

28.0 1.458 1.057

27.0 1.507 1.086

26.0 1.555 1.114

25.0 1.603 1.143

24.0 1.652 1.171

23.0 1.700 1.200

Thermal/Mechanical Specifications and Design Guidelines 45 Thermal Specifications

6.1.6 Thermal Metrology

The maximum TTV case temperatures (TCASE-MAX) can be derived from the data in the appropriate TTV thermal profile earlier in this chapter. The TTV TCASE is measured at the geometric top center of the TTV integrated heat spreader (IHS). Figure 6-5 illustrates the location where TCASE temperature measurements should be made. See Figure B-12 for drawing showing the thermocouple attach to the TTV package.

Figure 6-5. TTV Case Temperature (TCASE) Measurement Location

Measure TCASE at the geometric center of the package 37.5 37.5

37.5

Note: The following supplier can machine the groove and attach a thermocouple to the IHS. The supplier is listed below as a convenience to Intel’s general customers and the list may be subject to change without notice. THERM-X OF CALIFORNIA Inc, 3200 Investment Blvd, Hayward, Ca 94545. Ernesto B Valencia +1-510-441-7566 Ext. 242 [email protected]. The vendor part number is XTMS1565.

44 Thermal/Mechanical Specifications and Design Guidelines Thermal Specifications

6.2 Processor Thermal Features

6.2.1 Processor Temperature

A new feature in the processors is a software readable field in the IA32_TEMPERATURE_TARGET register that contains the minimum temperature at which the TCC will be activated and PROCHOT# will be asserted. The TCC activation temperature is calibrated on a part-by-part basis and normal factory variation may result in the actual TCC activation temperature being higher than the value listed in the register. TCC activation temperatures may change based on processor stepping, frequency or manufacturing efficiencies.

6.2.2 Adaptive Thermal Monitor

The Adaptive Thermal Monitor feature provides an enhanced method for controlling the processor temperature when the processor silicon exceeds the Thermal Control Circuit (TCC) activation temperature. Adaptive Thermal Monitor uses TCC activation to reduce processor power using a combination of methods. The first method (Frequency/VID control, similar to Thermal Monitor 2 (TM2) in previous generation processors) involves the processor reducing its operating frequency (using the core ratio multiplier) and input voltage (using the VID signals). This combination of lower frequency and VID results in a reduction of the processor power consumption. The second method (clock modulation, known as Thermal Monitor 1 or TM1 in previous generation processors) reduces power consumption by modulating (starting and stopping) the internal processor core clocks. The processor intelligently selects the appropriate TCC method to use on a dynamic basis. BIOS is not required to select a specific method (as with previous-generation processors supporting TM1 or TM2). The temperature at which Adaptive Thermal Monitor activates the Thermal Control Circuit is factory calibrated and is not user configurable. Snooping and interrupt processing are performed in the normal manner while the TCC is active.

When the TCC activation temperature is reached, the processor will initiate TM2 in attempt to reduce its temperature. If TM2 is unable to reduce the processor temperature, then TM1 will be also be activated. TM1 and TM2 will work together (clocks will be modulated at the lowest frequency ratio) to reduce power dissipation and temperature.

With a properly designed and characterized thermal solution, it is anticipated that the TCC would only be activated for very short periods of time when running the most power intensive applications. The processor performance impact due to these brief periods of TCC activation is expected to be so minor that it would be immeasurable. An under-designed thermal solution that is not able to prevent excessive activation of the TCC in the anticipated ambient environment may cause a noticeable performance loss,

and in some cases may result in a TCASE that exceeds the specified maximum temperature and may affect the long-term reliability of the processor. In addition, a thermal solution that is significantly under-designed may not be capable of cooling the processor even when the TCC is active continuously. Refer to the appropriate Thermal Mechanical Design Guidelines for information on designing a compliant thermal solution.

The Thermal Monitor does not require any additional hardware, software drivers, or interrupt handling routines. The following sections provide more details on the different TCC mechanisms used by the processor.

Thermal/Mechanical Specifications and Design Guidelines 45 Thermal Specifications

6.2.2.1 Frequency/VID Control

When the Digital Temperature Sensor (DTS) reaches a value of 0 (DTS temperatures reported using PECI may not equal zero when PROCHOT# is activated, see Section 6.2.2.5 for further details), the TCC will be activated and the PROCHOT# signal will be asserted. This indicates the processors' temperature has met or exceeded the factory calibrated trip temperature and it will take action to reduce the temperature. Upon activation of the TCC, the processor will stop the core clocks, reduce the core ratio multiplier by 1 ratio and restart the clocks. All processor activity stops during this frequency transition which occurs within 2 us. Once the clocks have been restarted at the new lower frequency, processor activity resumes while the voltage requested by the VID lines is stepped down to the minimum possible for the particular frequency. Running the processor at the lower frequency and voltage will reduce power consumption and should allow the processor to cool off. If after 1ms the processor is still too hot (the temperature has not dropped below the TCC activation point, DTS still = 0 and PROCHOT is still active), then a second frequency and voltage transition will take place. This sequence of temperature checking and Frequency/VID reduction will continue until either the minimum frequency has been reached or the processor temperature has dropped below the TCC activation point. If the processor temperature remains above the TCC activation point even after the minimum frequency has been reached, then clock modulation (described below) at that minimum frequency will be initiated. There is no end user software or hardware mechanism to initiate this automated TCC activation behavior. A small amount of hysteresis has been included to prevent rapid active/inactive transitions of the TCC when the processor temperature is near the TCC activation temperature. Once the temperature has dropped below the trip temperature, and the hysteresis timer has expired, the operating frequency and voltage transition back to the normal system operating point using the intermediate VID/frequency points. Transition of the VID code will occur first, to insure proper operation as the frequency is increased. Refer to Figure 6-6 for an illustration of this ordering.

Figure 6-6. Frequency and Voltage Ordering

Temperature

fMAX

f1 f 2 Frequency

VIDfMAX

VIDf1 VIDf 2 VID

PROCHOT# Time

44 Thermal/Mechanical Specifications and Design Guidelines Thermal Specifications

6.2.2.2 Clock Modulation

Clock modulation is a second method of thermal control available to the processor. Clock modulation is performed by rapidly turning the clocks off and on at a duty cycle that should reduce power dissipation by about 50% (typically a 30-50% duty cycle). Clocks often will not be off for more than 32 microseconds when the TCC is active. Cycle times are independent of processor frequency. The duty cycle for the TCC, when activated by the Thermal Monitor, is factory configured and cannot be modified.

It is possible for software to initiate clock modulation with configurable duty cycles.

A small amount of hysteresis has been included to prevent rapid active/inactive transitions of the TCC when the processor temperature is near its maximum operating temperature. Once the temperature has dropped below the maximum operating temperature, and the hysteresis timer has expired, the TCC goes inactive and clock modulation ceases.

6.2.2.3 Immediate Transition to combined TM1 and TM2

As mentioned above, when the TCC is activated the processor will sequentially step down the ratio multipliers and VIDs in an attempt to reduce the silicon temperature. If the temperature continues to increase and exceeds the TCC activation temperature by approximately 5 oC before the lowest ratio/VID combination has been reached, then the processor will immediately transition to the combined TM1/TM2 condition. The processor will remain in this state until the temperature has dropped below the TCC activation point. Once below the TCC activation temperature, TM1 will be discontinued and TM2 will be exited by stepping up to the appropriate ratio/VID state.

6.2.2.4 Critical Temperature Flag If TM2 is unable to reduce the processor temperature, then TM1 will be also be activated. TM1 and TM2 will then work together to reduce power dissipation and temperature. It is expected that only a catastrophic thermal solution failure would create a situation where both TM1 and TM2 are active. If TM1 and TM2 have both been active for greater than 20ms and the processor temperature has not dropped below the TCC activation point, then the Critical Temperature Flag in the IA32_THERM_STATUS MSR will be set. This flag is an indicator of a catastrophic thermal solution failure and that the processor cannot reduce its temperature. Unless immediate action is taken to resolve the failure, the processor will probably reach the Thermtrip temperature (see Section 6.2.3 Thermtrip Signal) within a short time. In order to prevent possible permanent silicon damage, Intel recommends removing power from the processor within ½ second of the Critical Temperature Flag being set

6.2.2.5 PROCHOT# Signal An external signal, PROCHOT# (processor hot), is asserted when the processor core temperature has exceeded its specification. If Adaptive Thermal Monitor is enabled (note it must be enabled for the processor to be operating within specification), the TCC will be active when PROCHOT# is asserted. The processor can be configured to generate an interrupt upon the assertion or de- assertion of PROCHOT#. Although the PROCHOT# signal is an output by default, it may be configured as bi- directional. When configured in bi-directional mode, it is either an output indicating the processor has exceeded its TCC activation temperature or it can be driven from an

Thermal/Mechanical Specifications and Design Guidelines 45 Thermal Specifications

external source (such as, a voltage regulator) to activate the TCC. The ability to activate the TCC using PROCHOT# can provide a means for thermal protection of system components. As an output, PROCHOT# (Processor Hot) will go active when the processor temperature monitoring sensor detects that one or more cores has reached its maximum safe operating temperature. This indicates that the processor Thermal Control Circuit (TCC) has been activated, if enabled. As an input, assertion of PROCHOT# by the system will activate the TCC for all cores. TCC activation when PROCHOT# is asserted by the system will result in the processor immediately transitioning to the minimum frequency and corresponding voltage (using Freq/VID control). Clock modulation is not activated in this case. The TCC will remain active until the system de-asserts PROCHOT#. Use of PROCHOT# in bi-directional mode can allow VR thermal designs to target maximum sustained current instead of maximum current. Systems should still provide proper cooling for the VR, and rely on PROCHOT# only as a backup in case of system cooling failure. The system thermal design should allow the power delivery circuitry to operate within its temperature specification even while the processor is operating at its Thermal Design Power. 6.2.3 THERMTRIP# Signal Regardless of whether or not Adaptive Thermal Monitor is enabled, in the event of a catastrophic cooling failure, the processor will automatically shut down when the silicon has reached an elevated temperature (refer to the THERMTRIP# definition in the processor Datasheet; see Section 1.1, “Reference Documents”). At this point, the THERMTRIP# signal will go active and stay active as described in the processor Datasheet. THERMTRIP# activation is independent of processor activity. If THERMTRIP# is asserted, processor core voltage (VCC) must be removed within the timeframe defined in the processor Datasheet. The temperature at which THERMTRIP# asserts is not user configurable and is not software visible.

6.3 Intel® Turbo Boost Technology

Intel® Turbo Boost Technology is a feature that allows the processor to opportunistically and automatically run faster than its rated operating core and/or render clock frequency when there is sufficient power headroom, and the product is within specified temperature and current limits. The Intel® Turbo Boost Technology feature is designed to increase performance of both multi-threaded and single- threaded workloads. The processor supports a Turbo mode where the processor can utilize the thermal capacitance associated with the package and run at power levels higher than TDP power for short durations. This improves the system responsiveness for short, bursty usage conditions. The turbo feature needs to be properly enabled by BIOS for the processor to operate with maximum performance. Since the turbo feature is configurable and dependent on many platform design limits outside of the processor control, the maximum performance cannot be guaranteed.

Turbo Mode availability is independent of the number of active cores; however, the Turbo Mode frequency is dynamic and dependent on the instantaneous application power load, the number of active cores, user configurable settings, operating environment and system design. Intel® Turbo Boost Technology may not be available on all SKUs.

44 Thermal/Mechanical Specifications and Design Guidelines Thermal Specifications

6.3.1 Intel® Turbo Boost Technology Frequency

The processor’s rated frequency assumes that all execution cores are running an application at the Thermal Design Power (TDP). However, under typical operation, not all cores are active. Therefore most applications are consuming less than the TDP at the rated frequency. To take advantage of the available TDP headroom, the active cores can increase their operating frequency.

To determine the highest performance frequency amongst active cores, the processor takes the following into consideration: • The number of cores operating in the C0 state. • The estimated current consumption. • The estimated power consumption. •The temperature.

Any of these factors can affect the maximum frequency for a given workload. If the power, current, or thermal limit is reached, the processor will automatically reduce the frequency to stay with its TDP limit.

Note: Intel Turbo Boost Technology processor frequencies are only active if the operating system is requesting the P0 state.

6.3.2 Intel® Turbo Boost Technology Graphics Frequency

Graphics render frequency is selected by the processor dynamically based on the graphics workload demand. The processor can optimize both processor and integrated graphics performance through managing total package power. For the integrated graphics, this could mean an increase in the render core frequency (above its base frequency) and increased graphics performance. In addition, the processor core can increase its frequency higher than it would without power sharing.

Enabling Intel® Turbo Boost Technology will maximize the performance of the processor core and the graphics render frequency within the specified package power levels. Compared with previous generation products, Intel® Turbo Boost Technology will increase the ratio of application power to TDP. Thus, thermal solutions and platform cooling that are designed to less than thermal design guidance might experience thermal and performance issues since more applications will tend to run at the maximum power limit for significant periods of time.

Thermal/Mechanical Specifications and Design Guidelines 45 Thermal Specifications

6.4 Thermal Considerations

Intel Turbo Boost Technology allows processor cores and Processor Graphics cores to run faster than the baseline frequency. During a turbo event, the processor can exceed its TDP power for brief periods. Turbo is invoked opportunistically and automatically as long as the processor is conforming to its temperature, power delivery, and current specification limits. Thus, thermal solutions and platform cooling that are designed to be less than thermal design guidance may experience thermal and performance issues since more applications will tend to run at or near the maximum power limit for significant periods of time.

6.4.1 Intel® Turbo Boost Technology Power Control and Reporting

When operating in the turbo mode, the processor will monitor its own power and adjust the turbo frequency to maintain the average power within limits over a thermally significant time period. The package, processor core, and graphic core powers are estimated using architectural counters and do not rely on any input from the platform.

The behavior of turbo is dictated by the following controls that are accessible using MSR, MMIO, or PECI interfaces: • POWER_LIMIT_1: TURBO_POWER_LIMIT, MSR 610h, bits 14:0. This value sets the exponentially weighted moving average power limit over a long time period. This is normally aligned to the TDP of the part and steady-state cooling capability of the thermal solution. This limit may be set lower than TDP, real-time, for specific needs, such as responding to a thermal event. If set lower than TDP, the processor may not be able to honor this limit for all workloads since this control only applies in the turbo frequency range; a very high powered application may exceed POWER_LIMIT_1, even at non-turbo frequencies. The default value is the TDP for the SKU. • POWER_LIMIT_1_TIME: TURBO _POWER_LIMIT, MSR 610h, bits 23:17. This value is a time parameter that adjusts the algorithm behavior. The exponentially weighted moving average turbo algorithm will use this parameter to maintain time averaged power at or below POWER_LIMIT_1. The default and recommended is 1 second for desktop applications. • POWER_LIMIT_2: TURBO_POWER_LIMIT, MSR 610h, bits 46:32. This value establishes the upper power limit of turbo operation above TDP, primarily for platform power supply considerations. Power may exceed this limit for up to 10 mS. The default for this limit is 1.25 x TDP.

44 Thermal/Mechanical Specifications and Design Guidelines Thermal Specifications

The following considerations and limitations apply to the power monitoring feature: • Calibration applies to the processor family and is not conducted on a part-by-part basis. Therefore, some difference between actual and reported power may be observed. • Power monitoring is calibrated with a variety of common, realistic workloads near Tj_max. Workloads with power characteristic markedly different from those used during the calibration process or lower temperatures may result in increased differences between actual and estimated power. • In the event an uncharacterized workload or power “virus” application were to result in exceeding programmed power limits, the processor Thermal Control Circuitry (TCC) will protect the processor when properly enabled. Adaptive Thermal Monitor must be enabled for the processor to remain within specification.

Illustration of Intel Turbo Boost Technology power control is shown in the following sections and figures. Multiple controls operate simultaneously allowing for customization for multiple system thermal and power limitations. These controls allow for turbo optimizations within system constraints.

6.4.2 Package Power Control

The package power control allows for customization to implement optimal turbo within platform power delivery and package thermal solution limitations. Figure 6-7. Package Power Control

SystemTurbo Algorithm Thermal ResponseResponse TimeTime

Thermal/Mechanical Specifications and Design Guidelines 45 Thermal Specifications

6.4.3 Power Plane Control

The processor core and graphics core power plane controls allow for customization to implement optimal turbo within voltage regulator thermal limitations. It is possible to use these power plane controls to protect the voltage regulator from overheating due to extended high currents. Power limiting per plane cannot be guaranteed below 1 second and accuracy cannot be guaranteed in all usages. This function is similar to the package level long duration window control.

6.4.4 Turbo Time Parameter

'Turbo Time Parameter' is a mathematical parameter (units in seconds) that controls the processor turbo algorithm using an exponentially weighted moving average of energy usage. During a maximum power turbo event of about 1.25 x TDP, the processor could sustain Power_Limit_2 for up to approximately 1.5 the Turbo Time Parameter. If the power value is changed during runtime, it may take a period of time (possibly up to approximately 3 to 5 times the ‘Turbo Time Parameter’, depending on the magnitude of the change and other factors) for the algorithm to settle at the new control limits.

44 Thermal/Mechanical Specifications and Design Guidelines PECI Interface

7 PECI Interface

7.1 Platform Environment Control Interface (PECI)

7.1.1 Introduction

PECI uses a single wire for self-clocking and data transfer. The bus requires no additional control lines. The physical layer is a self-clocked one-wire bus that begins each bit with a driven, rising edge from an idle level near zero volts. The duration of the signal driven high depends on whether the bit value is a logic ‘0’ or logic ‘1’. PECI also includes variable data transfer rate established with every message. In this way, it is highly flexible even though underlying logic is simple.

The interface design was optimized for interfacing to Intel processors in both single processor and multiple processor environments. The single wire interface provides low board routing overhead for the multiple load connections in the congested routing area near the processor and chipset components. Bus speed, error checking, and low protocol overhead provides adequate link bandwidth and reliability to transfer critical device operating conditions and configuration information.

The PECI bus offers: • A wide speed range from 2 Kbps to 2 Mbps • CRC check byte used to efficiently and atomically confirm accurate data delivery • Synchronization at the beginning of every message minimizes device timing accuracy requirements.

For desktop temperature monitoring and fan speed control management purposes, the PECI 3.0 commands that are commonly implemented includes Ping(), GetDIB(), GetTemp(), TCONTROL and TjMax(TCC) read. The TCONTROL and TCC read command can be implemented by utilizing the RdPkgConfig() command.

7.1.1.1 Fan Speed Control with Digital Thermal Sensor

Processor fan speed control is managed by comparing DTS temperature data against the processor-specific value stored in the static variable, TCONTROL. When the DTS temperature data is less than TCONTROL, the fan speed control algorithm can reduce the speed of the thermal solution fan. This remains the same as with the previous guidance for fan speed control. Please refer to Section 6.1.3 for guidance where the DTS temperature data exceeds TCONTROL. The DTS temperature data is delivered over PECI, in response to a GetTemp() command, and reported as a relative value to TCC activation target. The temperature data reported over PECI is always a negative value and represents a delta below the onset of thermal control circuit (TCC) activation, as indicated by the PROCHOT# signal. Therefore, as the temperature approaches TCC activation, the value approaches zero degrees.

Thermal/Mechanical Specifications and Design Guidelines 61 PECI Interface

62 Thermal/Mechanical Specifications and Design Guidelines Sensor Based Thermal Specification Design Guidance

8 Sensor Based Thermal Specification Design Guidance

The sensor based thermal specification presents opportunities for the system designer to optimize the acoustics and simplify thermal validation. The sensor based specification utilizes the Digital Thermal Sensor information accessed using the PECI interface.

This chapter will review thermal solution design options, fan speed control design guidance & implementation options and suggestions on validation both with the TTV and the live die in a shipping system.

Note: A new fan speed control implementation scheme is called DTS 1.1 introduced in Section 8.4.3.

8.1 Sensor Based Specification Overview (DTS 1.0)

Create a thermal specification that meets the following requirements: • Use Digital Thermal Sensor (DTS) for real-time thermal specification compliance. • Single point of reference for thermal specification compliance over all operating conditions. • Does not required measuring processor power & case temperature during functional system thermal validation.

• Opportunity for acoustic benefits for DTS values between TCONTROL and -1.

Thermal specifications based on the processor case temperature have some notable gaps to optimal acoustic design. When the ambient temperature is less than the maximum design point, the fan speed control system (FSC) will over cool the processor. The FSC has no feedback mechanism to detect this over cooling, this is shown in the top half of Figure 8-1.

The sensor based specification will allow the FSC to be operated at the maximum allowable silicon temperature or TJ for the measured ambient. This will provide optimal acoustics for operation above TCONTROL. See lower half of Figure 8-1.

Thermal/Mechanical Specifications and Design Guidelines 63 Sensor Based Thermal Specification Design Guidance

Figure 8-1. Comparison of Case Temperature versus Sensor Based Specification

Ta = 45.1 °C

Tcontrol

Ta = 30 °C -ca = 0.292

Power TDP Current Specification (Case Temp)

-ca = 0.448 -ca = 0.564

Tcontrol Ta = 30 C

Power TDP Sensor Based Specification (DTS Temp)

64 Thermal/Mechanical Specifications and Design Guidelines Sensor Based Thermal Specification Design Guidance

8.2 Sensor Based Thermal Specification

The sensor based thermal specification consists of two parts. The first is a thermal profile that defines the maximum TTV TCASE as a function of TTV power dissipation. The thermal profile defines the boundary conditions for validation of the thermal solution.

The second part is a defined thermal solution performance (CA) as a function of the DTS value as reported over the PECI bus when DTS is greater than TCONTROL. This defines the operational limits for the processor using the TTV validated thermal solution.

8.2.1 TTV Thermal Profile

For the sensor based specification, the only reference made to a case temperature measurement is on the TTV. Functional thermal validation will not require the user to apply a thermocouple to the processor package or measure processor power.

Note: All functional compliance testing will be based on fan speed response to the reported DTS values above TCONTROL. As a result, no conversion of TTV TCASE to processor TCASE will be necessary.

A knowledge of the system boundary conditions is necessary to perform the heatsink validation. Section 8.3.1 will provide more detail on defining the boundary conditions. The TTV is placed in the socket and powered to the recommended value to simulate the TDP condition. See Figure 8-2 for an example of the Intel® Core™ i7-2000 and i5-2000 desktop processor series (Quad Core 95W) TTV thermal profile.

Figure 8-2. Intel® Core™ i7-2000 and i5-2000 Desktop Processor Series (Quad Core 95W) Thermal Profile

TTV Thermal Profile

75.0

Y = Power x 0.29 + 45.1 70.0

65.0

60.0

55.0

50.0

TTVTemperature Case (°C) 45.0

40.0 0 20406080100 TTV Power (W)

Note: This graph is provided as a reference, the complete thermal specification is in Chapter 6.

Thermal/Mechanical Specifications and Design Guidelines 65 Sensor Based Thermal Specification Design Guidance

8.2.2 Specification When DTS value is Greater than TCONTROL

The product specification provides a table of CA values at DTS = TCONTROL and DTS = -1 as a function of TAMBIENT (inlet to heatsink). Between these two defined points, a linear interpolation can be done for any DTS value reported by the processor. A copy of the specification is provided as a reference in Table 8-3 of Section 8.6.

The fan speed control algorithm has enough information using only the DTS value and TAMBIENT to command the thermal solution to provide just enough cooling to keep the part on the thermal profile.

As an example, the data in Table 8-3 has been plotted in Figure 8-3 to show the required CA at 25, 30, 35 and 40 °C TAMBIENT. The lower the ambient, the higher the required CA which means lower fan speeds and reduced acoustics from the processor thermal solution.

In the prior thermal specifications this region, DTS values greater than TCONTROL, was defined by the processor thermal profile. This required the user to estimate the processor power and case temperature. Neither of these two data points are accessible in real time for the fan speed control system. As a result, the designer had to assume the worst case TAMBIENT and drive the fans to accommodate that boundary condition. Figure 8-3. Thermal solution Performance

0.700

0.650

0.600

0.550

0.500

0.450

Ta = 40 °C

TTV [C/W] Theta_ca 0.400 Ta = 35 °C 0.350 Ta = 30 °C Ta = 25 °C 0.300 TTV Ψ_ca @ DTS = Tcontrol TTV Ψ_ca @ DTS = -1

66 Thermal/Mechanical Specifications and Design Guidelines Sensor Based Thermal Specification Design Guidance

8.3 Thermal Solution Design Process

Thermal solution design guidance for this specification is the same as with previous products. The initial design needs to take into account the target market and overall product requirements for the system. This can be broken down into several steps: • Boundary condition definition • Thermal design / modelling •Thermal testing.

8.3.1 Boundary Condition Definition

Using the knowledge of the system boundary conditions (such as inlet air temperature, acoustic requirements, cost, design for manufacturing, package and socket mechanical specifications and chassis environmental test limits) the designer can make informed thermal solution design decisions.

For the Intel® Core™ i7-2000 and i5-2000 desktop processor series (Quad Core 95W) the thermal boundary conditions for an ATX tower system are as follows:

•TEXTERNAL = 35 °C. This is typical of a maximum system operating environment

•TRISE = 5 °C. This is typical of a chassis compliant to CAG 1.1 or TAC 2.0

•TAMBIENT = 40 °C (TAMBIENT = TEXTERNAL + TRISE)

Based on the system boundary conditions, the designer can select a TAMBIENT and CA to use in thermal modelling. The assumption of a TAMBIENT has a significant impact on the required CA needed to meet TTV TCASEMAX at TDP. A system that can deliver lower assumed TAMBIENT can utilize a design with ahigher CA, which can have a lower cost. Figure 8-4 shows a number of satisfactory solutions for the Intel® Core™ i7-2000 and i5-2000 desktop processor series (Quad Core 95W).

Note: If the assumed TAMBIENT is inappropriate for the intended system environment, the thermal solution performance may not be sufficient to meet the product requirements. The results may be excessive noise from fans having to operate at a speed higher than intended. In the worst case this can lead to performance loss with excessive activation of the Thermal Control Circuit (TCC).

Thermal/Mechanical Specifications and Design Guidelines 67 Sensor Based Thermal Specification Design Guidance

Figure 8-4. Example: Required CA for Various TAMBIENT Conditions

Note: If an ambient of greater than 45.1 °C is necessary based on the boundary conditions a thermal solution with a CA lower than 0.29 °C/W will be required.

8.3.2 Thermal Design and Modelling

Based on the boundary conditions, the designer can now make the design selection of the thermal solution components. The major components that can be mixed are the fan, fin geometry, heat pipe or air cooled solid core design. There are cost and acoustic trade-offs the customer can make.

To aide in the design process Intel provides TTV thermal models. Please consult your Intel Field Sales Engineer for these tools.

8.3.3 Thermal Solution Validation

8.3.3.1 Test for Compliance to the TTV Thermal Profile

This step is the same as previously suggested for prior products. The thermal solution is mounted on a test fixture with the TTV and tested at the following conditions: • TTV is powered to the TDP condition • Thermal solution fan operating at full speedMaximum airlflow through heatsink

•TAMBIENT at the boundary condition from Section 8.3.1

The following data is collected: TTV power, TTV TCASE and TAMBIENT. and used to calculate CA which is defined as:

CA = (TTV TCASE - TAMBIENT) / Power

68 Thermal/Mechanical Specifications and Design Guidelines Sensor Based Thermal Specification Design Guidance

This testing is best conducted on a bench to eliminate as many variables as possible when assessing the thermal solution performance. The boundary condition analysis as described in Section 8.3.1 should help in making the bench test simpler to perform.

8.3.3.2 Thermal Solution Characterization for Fan Speed Control

The final step in thermal solution validation is to establish the thermal solution performance,CA and acoustics as a function of fan speed. This data is necessary to allow the fan speed control algorithm developer to program the device. It also is needed to asses the expected acoustic impact of the processor thermal solution in the system. The characterization data should be taken over the operating range of the fan. Using the RCBF7-1156 (DHA-A) as the example the fan is operational from 900 to 3150 RPM. The data was collected at several points and a curve was fit to the data, see Figure 8-5. Taking data at 6 evenly distributed fan speeds over the operating range should provide enough data to establish an equation. By using the equation from the curve fitting, a complete set of required fan speeds as a function of CA can be developed. The results from the reference thermal solution characterization are provided in Table 8-3. The fan speed control device may modulate the thermal solution fan speed (RPM) by one of two methods. The first and preferred is pulse width modulation (PWM) signal compliant to the 4-Wire Pulse Width Modulation (PWM) Controlled Fans specification. The alternative is varying the input voltage to the fan. As a result the characterization data needs to also correlate the RPM to PWM or voltage to the thermal solution fan. The fan speed algorithm developer needs to associate the output command from the fan speed control device with the required thermal solution performance as stated in Table 8-3. Regardless of which control method is used, the term RPM will be used to indicate required fan speed in the rest of this document.

Note: When selecting a thermal solution from a thermal vendor, the characterization data should be requested directly from them as a part of their thermal solution collateral. Figure 8-5. Thermal Solution Performance versus Fan Speed

RPM vs. Measured Thermal Performance

0.450

0.400

Psi-ca (°C/W) Psi-ca 0.350

0.300 1500 2000 2500 3000 3500

RPM

Note: This data is taken from the preliminary evaluation of the validation of the RCBF7-1156 (DHA-A) reference processor thermal solution. The CA versus RPM data is available in Table 8-3 at the end of this chapter.

Thermal/Mechanical Specifications and Design Guidelines 69 Sensor Based Thermal Specification Design Guidance

8.4 Fan Speed Control (FSC) Design Process

The next step is to incorporate the thermal solution characterization data into the algorithms for the device controlling the fans.

As a reminder the requirements are:

• When the DTS value is at or below TCONTROL, the fans can be slowed down - just as with prior processors.

• When DTS is above TCONTROL, FSC algorithms will use knowledge of TAMBIENT and CA versus RPM to achieve the necessary level of cooling.

DTS 1.1 provides another option to do fan speed control without the Tambient data. Please refer to Section 8.4.3 for more details.This chapter will discuss two implementations. The first is a FSC system that is not provided the TAMBIENT information and a FSC system that is provided data on the current TAMBIENT. Either method will result in a thermally compliant solution and some acoustic benefit by operating the processor closer to the thermal profile. But only the TAMBIENT aware FSC system can fully utilize the specification for optimized acoustic performance.

In the development of the FSC algorithm it should be noted that the TAMBIENT is expected to change at a significantly slower rate than the DTS value. The DTS value will be driven by the workload on the processor and the thermal solution will be required to respond to this much more rapidly than the changes in TAMBIENT.

An additional consideration in establishing the fan speed curves is to account for the thermal interface material performance degradation over time.

8.4.1 Fan Speed Control Algorithm without TAMBIENT Data

In a system that does not provide the FSC algorithm with the TAMBIENT information, the designer must make the following assumption:

• When the DTS value is greater than TCONTROL, the TAMBIENT is at boundary condition derived in Section 8.3.1.

This is consistent past FSC guidance from Intel, to accelerate the fan to full speed when the DTS value is greater than TCONTROL. As will be shown below, the DTS thermal specification at DTS = TCONTROL can reduce some of the over cooling of the processor and provide an acoustic noise reduction from the processor thermal solution.

In this example the following assumptions are made:

•TAMBIENT = 40 °C • Thermal Solution designed / validated to a 40 °C environment

•TCONTROL = -20 • Reference processor thermal solution (RCFH7-1156 (DHA-A))

•Below TCONTROL the fan speed is slowed down as in prior products

For a processor specification based on a TCASE thermal profile, when the DTS value is equal to or greater than TCONTROL, the fan speed must be accelerated to full speed. For the reference thermal solution, full speed is 3150 RPM (dashed line in Figure 8-6). The DTS thermal specification defines a required CA at TCONTROL and the fan speed is 2300 RPM. This is much less than full speed even when assuming the TAMBIENT = 40 °C (solid line in Figure 8-6). The shaded area displayed in Figure 8-6 is where DTS values are

70 Thermal/Mechanical Specifications and Design Guidelines Sensor Based Thermal Specification Design Guidance

less than TCONTROL. For simplicity, the graph shows a linear acceleration of the fans from TCONTROL - 10 to TCONTROL as has been Intel’s guidance for simple fan speed control algorithms.

As the processor workload continues to increase, the DTS value will increase and the FSC algorithm will linearly increase the fan speed from the 2300 RPM at DTS = -20 to full speed at DTS value = -1.

Figure 8-6. Fan Response Without TAMBIENT Data

8.4.2 Fan Speed Control Algorithm with TAMBIENT Data

In a system where the FSC algorithm has access to the TAMBIENT information and is capable of using the data the benefits of the DTS thermal specification become more striking.

As will be demonstrated below, there is still over cooling of the processor, even when compared to a nominally ambient aware thermal solution equipped with a thermistor. An example of these thermal solutions are the RCFH7-1156 (DHA-A) or the boxed processor thermal solutions. This over cooling translates into acoustic margin that can be used in the overall system acoustic budget.

In this example the following assumptions are made:

•TAMBIENT = 35 °C • The same Thermal Solution designed / validated to a 40 °C environment as used in the example in Section 8.4.1

•TCONTROL = -20

• FSC device has access to TAMBIENT data • Reference processor thermal solution (RCFH7-1156 (DHA-A))

•Below TCONTROL the fan speed is slowed down as in prior products

Thermal/Mechanical Specifications and Design Guidelines 71 Sensor Based Thermal Specification Design Guidance

For a processor specification based on a TCASE thermal profile, when the DTS value is equal to or greater than TCONTROL, the fan speed is accelerated to maximum fan speed for the TAMBIENT as controlled by the thermistor in thermal solution. For the RCFH7- 1156 (DHA-A), this would be about 2150 RPM at 35 °C. This is graphically displayed as the dashed line in Figure 8-7.

This is an improvement over the ambient unaware system but is not fully optimized for acoustic benefit. The DTS thermal specification required CA and therefore the fan speed in this scenario is 1500 RPM. This is less than thermistor controlled speed of 2150 RPM - even if the assumption is a TAMBIENT = 35 °C. This is graphically displayed in Figure 8-7.

The shaded area displayed in Figure 8-7 is where DTS values are less than TCONTROL. For simplicity the graph shows a linear acceleration of the fans from TCONTROL - 10 to TCONTROL as has been Intel’s guidance for simple fan speed control algorithms.

As the processor workload continues to increase, the DTS value will increase and the FSC algorithm will linearly increase the fan speed from the 1500 RPM at DTS = -20 to 2150 RPM at DTS value = -1.

Figure 8-7. Fan Response with TAMBIENT Aware FSC

72 Thermal/Mechanical Specifications and Design Guidelines Sensor Based Thermal Specification Design Guidance

8.4.3 DTS 1.1 A New Fan Speed Control Algorithm without TAMBIENT Data In most system designs incorporating processor ambient inlet data in fan speed control adds design and validation complexity with a possible BOM cost impact to the system. A new fan speed control methodology is introduced to improve system acoustics without needing the processor inlet ambient information.

The DTS 1.1 implementation consists of two parts, a CA requirement at TCONTROL and a CA point at DTS = -1.

The CA point at DTS = -1 defines the minimum CA required at TDP considering the worst case system design Tambient design point:

CA = (TCASE_max - TAmbient target) / TDP

For example, for a 95 TDP part, the Tcase max is 72.6C and at a worst case design point of 40C local ambient this will result in

CA = (72.6 - 40) / 95 = 0.34 C/W

Similarly for a system with a design target of 45 C ambient the CA at DTS = -1 needed will be 0.29 C/W.

The second point defines the thermal solution performance (CA) at TCONTROL. Table 8-1 lists the required CA for various TDP processors.

These two points define the operational limits for the processor for DTS 1.1 implementation. At TCONTROL the fan speed must be programed such that the resulting CAis better than or equivalent to the required CA listed in Table 8-1. Similarly the fan speed should be set at DTS = -1 such that the thermal solution performance is better than or equivalent to the CArequirements at Tambient_Max. Based on the processor temperature, the fan speed controller must linearly change the fan speed from DTS = TCONTROL to DTS = -1 between these points. Figure 8-8 gives a visual description on DTS 1.1.

Thermal/Mechanical Specifications and Design Guidelines 73 Sensor Based Thermal Specification Design Guidance

Figure 8-8. DTS 1.1 Definition Points

Table 8-1. DTS 1.1 Thermal Solution Performance above TCONTROL

 at CA  at  at DTS = -1 CA CA  at DTS = -1 DTS = -1 Processor TDP CA At System DTS = T 1,2 At System At System CONTROL ambient_max= ambient_max = ambient_max = 40C 45C 50C

95W 0.564 0.343 0.291 0.238 65W 0.755 0.448 0.371 0.294 45W 1.165 0.662 0.551 0.440 35W 1.361 0.714 0.571 0.429

Notes: 1. CA at “DTS = Tcontrol” is applicable to systems that has Internal Trise (Troom temperature to Processor cooling fan inlet) of less than 10 C. In case your expected Trise is grater than 10 C a correction factor should be used as explained below. For each 1 deg C Trise above 10C, the correction factor CF is defined as CF= 1.7 / Processor_TDP. 2. Example, For A Chassis Trise assumption of 12 C for a 95W TDP processor. CF = 1.7/95W = 0.018/C For Trise > 10 C CA at Tcontrol = Value listed in Column_2 - (Trise - 10) * CF CA = 0564 - (12 - 10) * 0.018 =0.528 C/W In this case the fan speed should be set slightly higher equivalent to YCA=0.528C/W

74 Thermal/Mechanical Specifications and Design Guidelines Sensor Based Thermal Specification Design Guidance

8.4.4 Fan Speed Control Implementation Details

Most fan controllers allow programming a few “temperature versus PWM” or “temperature v.s RPM” points for fan speed control and do a linear interpolation between the points. Using Table 8-1 determine the CA requirements at TCONTROL and at DTS = -1. From the thermal solution performance characteristics (RPM versus CA) find equivalent RPM and PWM. Table 8-2 give an example of how a fan speed control table may look like for processor cooling needs. DTS 1.1 only specify the thermal performance needed at TCONTROL and at DTS = -1. All the other points can be defined as needed based on rest of the platform cooling needs.

Table 8-2. Fan Speed control example for 95W TDP processor1

Calculated Tj DTS values (assuming CA Example PWM% Example RPM TjMax = 99C)

DTS = -59 40C ... 20% 1000 DTS = -39 60C ... 30% 1050 ...... DTS = -20 79C 0.564 40% 1100 DTS = -1 98C 0.343 100% 3150

Notes: 1. This table is for illustration purposes only. PWM% and RPM numbers will vary based on system thermal solution for the required CA targets. For a typical chassis that has Trise lower than 10 °C, based on the reference thermal solution data, a fan speed of 1050 RPM will give the needed CA at TCONTROL. A maximum fan speed of 3150 RPM will be programmed for DTS = -1. As the processor workload continues to increase the DTS value will increase and the FSC algorithm will linearly increase the fan speed from the 1050 RPM at DTS = -20 to fans full speed at DTS = -1.

Figure 8-9 shows a comparison chart from this tool for various fan speed control options including DTS 1.1.

In this example the following assumptions are made:

•Operating TAMBIENT = 35 °C • Thermal Solution designed / validated to a 40 °C ambient max as used in the example in Section 8.4.1 Reference processor thermal solution (RCFH7-1156 (DHA-A))

•TCONTROL = -20

• For DTS 1.0 the FSC device has access to TAMBIENT data

•Below TCONTROL the fan speed is slowed down to minimum as in prior products • Power = 75 W with all cores active

Thermal/Mechanical Specifications and Design Guidelines 75 Sensor Based Thermal Specification Design Guidance

In Figure 8-9, the red line represents the DTS 1.1 fan speed control implementation. At 75 W the fans will be ~ 1600 RPM keeping the Tj at ~ 89C. Blue line represent DTS 1.0 with ambient sensor. The fans with DTS 1.0 will be roughly at the same speed ~ 1650 RPM resulting in Tj at ~ 88 °C. The Golden line represents the fan speed control option where fan ramps to keep the Tj at TCONTROL. Fan will be running full speed in this case with overcooling to CPU to Tj of ~ 81 °C. Below TCONTROL, the designer can set the fan speed to minimum or as desired by other system cooling needs.

Figure 8-9. Fan Response Comparison with Various Fan Speed Control Options

Notes: 1. Tj is the CPU temperatuers and can be calulated from relative DTS value (PECI) and TjMax register. Tj = DTS + TjMax(register)

8.5 System Validation

System validation should focus on ensuring the fan speed control algorithm is responding appropriately to the DTS values and TAMBIENT data in the case of DTS 1.0 as well as any other device being monitored for thermal compliance. Since the processor thermal solution has already been validated using the TTV to the thermal specifications at the predicted TAMBIENT, additional TTV based testing in the chassis is not necessary. Once the heatsink has been demonstrated to meet the TTV Thermal Profile, it should be evaluated on a functional system at the boundary conditions.

76 Thermal/Mechanical Specifications and Design Guidelines Sensor Based Thermal Specification Design Guidance

In the system under test and Power/Thermal Utility Software set to dissipate the TDP workload confirm the following item: • Verify if there is TCC activity by instrumenting the PROCHOT# signal from the processor. TCC activation in functional application testing is unlikely with a compliant thermal solution. Some very high power applications might activate TCC for short intervals this is normal.

• Verify fan speed response is within expectations - actual RPM (CA) is consistent with DTS temperature and TAMBIENT. • Verify RPM versus PWM command (or voltage) output from the FSC device is within expectations. • Perform sensitivity analysis to asses impact on processor thermal solution performance and acoustics for the following: — Other fans in the system. — Other thermal loads in the system.

In the same system under test, run real applications that are representative of the expected end user usage model and verify the following: • Verify fan speed response versus expectations as done using Power/Thermal Utility SW. • Validate system boundary condition assumptions: Trise, venting locations, other thermal loads and adjust models / design as required.

8.6 Thermal Solution Characterization

Table 8-3 is early engineering data on the RCBF7-1156 (DHA-A) thermal solution as a reference for the development of thermal solutions and the fan speed control algorithm.

Table 8-3. Thermal Solution Performance above TCONTROL (Sheet 1 of 2)

1 CA at RPM for CA at CA at RPM for CA at TAMBIENT 2 5 3 5 DTS = TCONTROL DTS = TCONTROL DTS = -1 DTS = -1 45.1 0.290 N/A 0.290 N/A 44.0 0.310 N/A 0.301 N/A 43.0 0.328 N/A 0.312 N/A 42.0 0.346 2950 0.322 N/A 41.0 0.364 2600 0.333 N/A 40.0 0.383 2300 0.343 3150 39.0 0.401 2100 0.354 2750 38.0 0.419 1900 0.364 2600 37.0 0.437 1750 0.375 2400 36.0 0.455 1650 0.385 2250 35.0 0.473 1500 0.396 2150 34.0 0.491 1400 0.406 2050 33.0 0.510 1350 0.417 1900 32.0 0.528 1200 0.427 1850 31.0 0.546 1150 0.438 1750 30.0 0.564 1050 0.448 1650 29.0 0.582 1000 0.459 1600

Thermal/Mechanical Specifications and Design Guidelines 77 Sensor Based Thermal Specification Design Guidance

Table 8-3. Thermal Solution Performance above TCONTROL (Sheet 2 of 2)

1 CA at RPM for CA at CA at RPM for CA at TAMBIENT 2 5 3 5 DTS = TCONTROL DTS = TCONTROL DTS = -1 DTS = -1 28.0 0.600 1000 0.469 1550 27.0 0.618 1000 0.480 1450 26.0 0.637 1000 0.491 1400 25.0 0.655 1000 0.501 1350 24.0 0.673 1000 0.512 1300 23.0 0.691 1000 0.522 1250 22.0 0.709 1000 0.533 1200 21.0 0.727 1000 0.543 1150 20.0 0.746 1000 0.554 1100

Notes: 1. The ambient temperature is measured at the inlet to the processor thermal solution 2. This column can be expressed as a function of TAMBIENT by the following equation: CA = 0.29 + (45.1 - TAMBIENT) x 0.0181 3. This column can be expressed as a function of TAMBIENT by the following equation: CA = 0.29 + (45.1 - TAMBIENT) x 0.0105 4. This table is provided as a reference please consult the product specification for current values. 5. Based on the testing performed a curve was fit to the data in the form Psi_ca = a x RPM3+b x RPM2+c x RPM + d, where: a = -1.53 E-11, b = 1.41 E-07, c = -0.00048, d = 0.925782 6. Full Speed of 3150 RPM the DHA-A thermal solution delivers a CA = 0.335 °C /W based on preliminary testing. 7. Minimum speed is limited to 1000 RPM to ensure cooling of other system components

78 Thermal/Mechanical Specifications and Design Guidelines ATX Reference Thermal Solution

9 ATX Reference Thermal Solution

Note: The reference thermal mechanical solution information shown in this document represents the current state of the data and may be subject to modification.The information represents design targets, not commitments by Intel.

The design strategy is to use the design concepts from the prior Intel® Radial Curved Bifurcated Fin Heatsink Reference Design (Intel® RCBFH Reference Design) designed originally for the Intel® Pentium® 4 processors.

This chapter describes the overall requirements for the ATX heatsink reference thermal solution supporting the processors including critical-to-function dimensions, operating environment, and validation criteria.

9.1 Heatsink Thermal Solution

The reference thermal solutions are active fan solution similar to the prior designs for the Intel® Pentium® 4 and Intel® Core™2 Duo processors. There are two designs being enabled. The first is called RCFH7-1156 (DHA-A) which is a universal design supporting the Intel® Core™ i7-2000 and i5-2000 desktop processor series (Quad Core 95W). The second is called the RCFH6-1156 (DHA-B) which only supports the Intel® Core™ i7- 2000 and i5-2000 desktop processor series (Quad Core 65W) and Intel® Core™ i3- 2000 desktop processor series (Dual Core 65W) and Intel® Pentium® processor G800 and G600 series (Dual Core 65W).

Table 9-1. Reference Thermal Solutions

Thermal Solution Name Processor

Intel® Core™ i7-2000 and i5-2000 desktop RCFH7-1156 (DHA-A) processor series (Quad Core 95W) Intel® Core™ i7-2000 and i5-2000 desktop processor series (Quad Core 65W) ® RCFH6-1156 (DHA-B) Intel Core™ i3-2000 desktop processor series (Dual Core 65W) and Intel® Pentium® processor G800 and G600 series (Dual Core 65W)

The two solutions are very similar. They both use an approximately 25 mm (1 inch) tall aluminum extrusion, integrated fan and molded plastic housing. The notable difference is the RCFH7-1156 has copper core to support the higher TDP as compared to the aluminum core of the RCFH6-1156. Theses designs integrate the metal clip used in prior reference designs into a molded assembly that includes the fan motor housing and wire guard. Figure 9-1 shows the reference thermal solution assembly. The heat sink attaches to the motherboard with the push pin fastener design from previous reference designs, see Figure B-6 through Figure B-9 for details on the push pin fastener design.

Thermal/Mechanical Specifications and Design Guidelines 79 ATX Reference Thermal Solution

Figure 9-1. ATX Heatsink Reference Design Assembly

80 Thermal/Mechanical Specifications and Design Guidelines ATX Reference Thermal Solution

9.2 Geometric Envelope for the Intel Reference ATX Thermal Mechanical Design

Figure 9-2 shows a 3-D representation of the board component keep out for the reference ATX thermal solution. A fully dimensioned drawing of the keep-out information is available at Figure B-1 and Figure B-2 in Appendix B. A PDF version of these drawings is available as well as a 3-D IGES model of the board level keep out zone is available. Contact your field sales representative for these documents.

Figure 9-2. ATX KOZ 3-D Model Primary (Top) Side

26.00mm Maximum 27.00mm Maximum Component Height Component Height (3 places) (3 places) 10.10mm Maximum Component Height (5 places)

2.07mm Maximum Component Height (1 place)

1.20mm Maximum Component Height (1 place) 1.6 mm Maximum Component Height 2.50mm Maximum (2 places) Component Height (6 places) Note: All Maximum Component Heights are post reflow / assembly

Note: The maximum height of the reference thermal solution (in Figure 9-2) above the motherboard is 46.00 mm [1.81 inches], and is compliant with the motherboard primary side height constraints defined in the ATX Specification and the microATX Motherboard Interface Specification found at http://www.formfactors.org.

The reference solution requires a chassis obstruction height of at least 81.30 mm [3.20 inches], measured from the top of the motherboard. This allows for appropriate fan inlet airflow to ensure fan performance, and therefore overall cooling solution performance. This is compliant with the recommendations found in both ATX Specification and microATX Motherboard Interface Specification documents.

Thermal/Mechanical Specifications and Design Guidelines 81 ATX Reference Thermal Solution

9.3 Reference Design Components

9.3.1 Extrusion

The aluminum extrusion design is similar to what is shown in Figure 9-3. To facilitate reuse of the core design, the center cylinder ID and wall thickness are the same as RCBFH3.

Figure 9-3. RCBFH Extrusion

82 Thermal/Mechanical Specifications and Design Guidelines ATX Reference Thermal Solution

9.3.2 Clip

This clip design is intended to adapt previous thermal solutions such as the RCBFH3 to comply with the mechanical and structural requirements for the LGA1155 socket. Structural design strategy for the clip is to provide sufficient load for the Thermal Interface Material (TIM). The clip does not have to provide additional load for socket solder joint protect.

The clip is formed from 1.6 mm carbon steel, the same material as used in previous clip designs. The target metal clip nominal stiffness is 493 N/mm [2813 lb/in]. The combined target for reference clip and fasteners nominal stiffness is 311 N/mm [1778 lb/in]. The nominal preload provided by the reference design is 175.7 ± 46.7 N [39.5 lb ±10.5 lbf].

Note: An updated clip drawing and IGES file is available please order 2009 Reference Thermal Solution Clip Mechanical Models and Mechanical Drawings to support power on with existing thermal solutions.

Note: Intel reserves the right to make changes and modifications to the design as necessary to the reference design, in particular the clip. Figure 9-4. Clip for Existing Solutions to straddle LGA1155 Socket

Thermal/Mechanical Specifications and Design Guidelines 83 ATX Reference Thermal Solution

9.3.3 Core

The core is the same forged design used in previous reference designs. This allows the reuse of the fan attach and if desired the same extrusion from existing designs. The machined flange height will be determined in the preliminary design review to match the IHS height for the processors when installed in the LGA1155. The final height of the flange will be an output of the design validation and could be varied to adjust the preload. See Section 9.4 for additional information on the critical to function interfaces between the core and clip.

Figure 9-5. Core

84 Thermal/Mechanical Specifications and Design Guidelines ATX Reference Thermal Solution

9.4 Mechanical Interface to the Reference Attach Mechanism

The attach mechanism component from the Intel Reference Design can be used by other 3rd party cooling solutions. The attach mechanism consists of: • A metal attach clip that interfaces with the heatsink core, see Figure B-10 and Figure B-11 for the clip drawings. • Four plastic fasteners, see Figure B-6, Figure B-7, Figure B-8 and Figure B-9 for the component drawings.

Note: For Intel RCFH6 and RCFH7 Reference Designs, the metal attach clip is not used by the solutions as shown in Figure 9-1. This metal attach clip design is only intended to adapt previous thermal solutions (such as the Intel RCBFH3 Reference Design) to comply with the mechanical and structural requirements for the LGA1155 socket.

If 3rd party cooling solutions adopt a previous thermal solutions (such as the Intel RCBFH3 Reference Design), the reference attach mechanism (clip, core and extrusion) portion is shown in Figure 9-6. The clip is assembled to heatsink during copper core insertion, and is meant to be trapped between the core shoulder and the extrusion as shown in Figure 9-7.

The critical to function mechanical interface dimensions are shown in Figure 9-7 and Figure 9-8. Complying with the mechanical interface parameters is critical to generating a heatsink preload compliant with the minimum preload requirement for the selected TIM and to not exceed the socket design limits.

Figure 9-6. Clip Core and Extrusion Assembly

Clip

Core shoulder traps clip in place

Thermal/Mechanical Specifications and Design Guidelines 85 ATX Reference Thermal Solution

Figure 9-7. Critical Parameters for Interface to the Reference Clip

Fan

Fin Array

Core

See Detail A

Clip

Fin Array

1.6 mm Clip Core

Detail A

Figure 9-8. Critical Core Dimensions

Dia 38.68 +/- 0.30mm

Dia 36.14 +/- 0.10 mm

Gap required to avoid core surface blemish during clip assembly. Recommend 0.3 mm min.

1.00 +/- 0.10 mm Core

1.00 mm min R 0.40 mm max

R 0.40 mm max

2.45 +/- 0.10 mm

86 Thermal/Mechanical Specifications and Design Guidelines ATX Reference Thermal Solution

9.5 Heatsink Mass & Center of Gravity

• Total mass including plastic fan housing and fasteners <500 g. • Assembly center of gravity  25.4 mm, measured from the top of the IHS.

9.6 Thermal Interface Material

A thermal interface material (TIM) provides conductivity between the IHS and heat sink. The designs use Dow Corning TC-1996. The TIM application is 0.14 g, which will be a nominal 20 mm diameter (~0.79 inches).

9.7 Heat Pipe Thermal Considerations

The following drawing shows the orientation and position of the 1155-land LGA Package TTV die, this is the same package layout as used in the 1156-land LGA Package TTV. The TTV die is sized and positioned similar to the production die.

Figure 9-9. TTV Die Size and Orientation

37.5 10.94 Die Centerline 37.5 Package Centerline

10.94

Drawing Not to Scale All Dimensions in mm

§§

Thermal/Mechanical Specifications and Design Guidelines 87 ATX Reference Thermal Solution

88 Thermal/Mechanical Specifications and Design Guidelines Thermal Solution Quality and Reliability Requirements

10 Thermal Solution Quality and Reliability Requirements

10.1 Reference Heatsink Thermal Verification

Each motherboard, heatsink and attach combination may vary the mechanical loading of the component. Based on the end user environment, the user should define the appropriate reliability test criteria and carefully evaluate the completed assembly prior to use in high volume. The Intel reference thermal solution will be evaluated to the boundary conditions in Chapter 5.

The test results, for a number of samples, are reported in terms of a worst-case mean + 3 value for thermal characterization parameter using the TTV.

10.2 Mechanical Environmental Testing

Each motherboard, heatsink and attach combination may vary the mechanical loading of the component. Based on the end user environment, the user should define the appropriate reliability test criteria and carefully evaluate the completed assembly prior to use in high volume. Some general recommendations are shown in Table 10-1.

The Intel reference heatsinks will be tested in an assembled to the LGA1155 socket and mechanical test package. Details of the Environmental Requirements, and associated stress tests, can be found in Table 10-1 are based on speculative use condition assumptions, and are provided as examples only.

Table 10-1. Use Conditions (Board Level)

Test1 Requirement Pass/Fail Criteria2

3 drops each for + and - directions in each of 3 perpendicular axes (that is, total 18 drops) Visual Check and Mechanical Shock Electrical Functional Profile: 50 g, Trapezoidal waveform, 4.3 m/s [170 in/s] Test minimum velocity change

Duration: 10 min/axis, 3 axes Frequency Range: 5 Hz to 500 Hz Visual Check and Random Vibration 5 Hz @ 0.01 g2/Hz to 20 Hz @ 0.02 g2/Hz (slope up) Electrical Functional 20 Hz to 500 Hz @ 0.02 g2/Hz (flat) Test Power Spectral Density (PSD) Profile: 3.13 g RMS

Notes: 1. It is recommended that the above tests be performed on a sample size of at least ten assemblies from multiple lots of material. 2. Additional pass/fail criteria may be added at the discretion of the user.

Thermal/Mechanical Specifications and Design Guidelines 89 Thermal Solution Quality and Reliability Requirements

10.2.1 Recommended Test Sequence

Each test sequence should start with components (that is, baseboard, heatsink assembly, and so on) that have not been previously submitted to any reliability testing.

Prior to the mechanical shock & vibration test, the units under test should be preconditioned for 72 hours at 45 ºC. The purpose is to account for load relaxation during burn-in stage.

The test sequence should always start with a visual inspection after assembly, and BIOS/Processor/memory test. The stress test should be then followed by a visual inspection and then BIOS/Processor/memory test.

10.2.2 Post-Test Pass Criteria

The post-test pass criteria are: 1. No significant physical damage to the heatsink and retention hardware. 2. Heatsink remains seated and its bottom remains mated flatly against the IHS surface. No visible gap between the heatsink base and processor IHS. No visible tilt of the heatsink with respect to the retention hardware. 3. No signs of physical damage on baseboard surface due to impact of heatsink. 4. No visible physical damage to the processor package. 5. Successful BIOS/Processor/memory test of post-test samples. 6. Thermal compliance testing to demonstrate that the case temperature specification can be met.

10.2.3 Recommended BIOS/Processor/Memory Test Procedures

This test is to ensure proper operation of the product before and after environmental stresses, with the thermal mechanical enabling components assembled. The test shall be conducted on a fully operational baseboard that has not been exposed to any battery of tests prior to the test being considered.

Testing setup should include the following components, properly assembled and/or connected: • Appropriate system baseboard. • Processor and memory. • All enabling components, including socket and thermal solution parts.

The pass criterion is that the system under test shall successfully complete the checking of BIOS, basic processor functions and memory, without any errors. Intel PC Diags is an example of software that can be utilized for this test.

90 Thermal/Mechanical Specifications and Design Guidelines Thermal Solution Quality and Reliability Requirements

10.3 Material and Recycling Requirements

Material shall be resistant to fungal growth. Examples of non-resistant materials include cellulose materials, animal and vegetable based adhesives, grease, oils, and many hydrocarbons. Synthetic materials such as PVC formulations, certain polyurethane compositions (such as polyester and some polyethers), plastics which contain organic fillers of laminating materials, paints, and varnishes also are susceptible to fungal growth. If materials are not fungal growth resistant, then MIL- STD-810E, Method 508.4 must be performed to determine material performance.

Material used shall not have deformation or degradation in a temperature life test.

Any plastic component exceeding 25 grams should be recyclable per the European Blue Angel recycling standards.

The following definitions apply to the use of the terms lead-free, Pb-free, and RoHS compliant.

Lead-free and Pb-free: Lead has not been intentionally added, but lead may still exist as an impurity below 1000 ppm.

RoHS compliant: Lead and other materials banned in RoHS Directive are either (1) below all applicable substance thresholds as proposed by the EU or (2) an approved/pending exemption applies.

Note: RoHS implementation details are not fully defined and may change.

Thermal/Mechanical Specifications and Design Guidelines 91 Thermal Solution Quality and Reliability Requirements

92 Thermal/Mechanical Specifications and Design Guidelines Boxed Processor Specifications

11 Boxed Processor Specifications

11.1 Introduction

The processor will also be offered as an Intel boxed processor. Intel boxed processors are intended for system integrators who build systems from baseboards and standard components. The boxed processor will be supplied with a cooling solution. This chapter documents baseboard and system requirements for the cooling solution that will be supplied with the boxed processor. This chapter is particularly important for OEMs that manufacture baseboards for system integrators.

Note: Unless otherwise noted, all figures in this chapter are dimensioned in millimeters and inches [in brackets]. Figure 11-1 shows a mechanical representation of a boxed processor.

Note: The cooling solution that is supplied with the boxed processor will be halogen free compliant.

Note: Drawings in this chapter reflect only the specifications on the Intel boxed processor product. These dimensions should not be used as a generic keep-out zone for all cooling solutions. It is the system designers’ responsibility to consider their proprietary cooling solution when designing to the required keep-out zone on their system platforms and chassis. Refer to Appendix B for further guidance on keep in and keep out zones.

Thermal/Mechanical Specifications and Design Guidelines 93 Boxed Processor Specifications

Figure 11-1. Mechanical Representation of the Boxed Processor

Note: The airflow of the fan heatsink is into the center and out of the sides of the fan heatsink.

11.2 Mechanical Specifications

11.2.1 Boxed Processor Cooling Solution Dimensions

This section documents the mechanical specifications of the boxed processor. The boxed processor will be shipped with an unattached fan heatsink. Figure 11-1 shows a mechanical representation of the boxed processor.

Clearance is required around the fan heatsink to ensure unimpeded airflow for proper cooling. The physical space requirements and dimensions for the boxed processor with assembled fan heatsink are shown in Figure 11-2 (Side View), and Figure 11-3 (Top View). The airspace requirements for the boxed processor fan heatsink must also be incorporated into new baseboard and system designs. Airspace requirements are shown in Figure 11-7 and Figure 11-8. Note that some figures have centerlines shown (marked with alphabetic designations) to clarify relative dimensioning.

94 Thermal/Mechanical Specifications and Design Guidelines Boxed Processor Specifications

Figure 11-2. Space Requirements for the Boxed Processor (side view)

Figure 11-3. Space Requirements for the Boxed Processor (top view)

Note: Diagram does not show the attached hardware for the clip design and is provided only as a mechanical representation.

Thermal/Mechanical Specifications and Design Guidelines 95 Boxed Processor Specifications

Figure 11-4. Space Requirements for the Boxed Processor (overall view)

11.2.2 Boxed Processor Fan Heatsink Weight

The boxed processor fan heatsink will not weigh more than 450 grams.

11.2.3 Boxed Processor Retention Mechanism and Heatsink Attach Clip Assembly

The boxed processor thermal solution requires a heatsink attach clip assembly, to secure the processor and fan heatsink in the baseboard socket. The boxed processor will ship with the heatsink attach clip assembly.

96 Thermal/Mechanical Specifications and Design Guidelines Boxed Processor Specifications

11.3 Electrical Requirements

11.3.1 Fan Heatsink Power Supply

The boxed processor's fan heatsink requires a +12 V power supply. A fan power cable will be shipped with the boxed processor to draw power from a power header on the baseboard. The power cable connector and pinout are shown in Figure 11-5. Baseboards must provide a matched power header to support the boxed processor. Table 11-1 contains specifications for the input and output signals at the fan heatsink connector.

The fan heatsink outputs a SENSE signal, which is an open- collector output that pulses at a rate of 2 pulses per fan revolution. A baseboard pull-up resistor provides VOH to match the system board-mounted fan speed monitor requirements, if applicable. Use of the SENSE signal is optional. If the SENSE signal is not used, pin 3 of the connector should be tied to GND.

The fan heatsink receives a PWM signal from the motherboard from the 4th pin of the connector labeled as CONTROL.

The boxed processor's fan heatsink requires a constant +12 V supplied to pin 2 and does not support variable voltage control or 3-pin PWM control.

The power header on the baseboard must be positioned to allow the fan heatsink power cable to reach it. The power header identification and location should be documented in the platform documentation, or on the system board itself. Figure 11-6 shows the location of the fan power connector relative to the processor socket. The baseboard power header should be positioned within 110 mm [4.33 inches] from the center of the processor socket.

Figure 11-5. Boxed Processor Fan Heatsink Power Cable Connector Description

Pin Signal Straight square pin, 4-pin terminal housing with 1 GND polarizing ribs and friction locking ramp. 2 +12 V 0.100" pitch, 0.025" square pin width. 3 SENSE 4 CONTROL Match with straight pin, friction lock header on mainboard.

1234

Thermal/Mechanical Specifications and Design Guidelines 97 Boxed Processor Specifications

Table 11-1. Fan Heatsink Power and Signal Specifications

Description Min Typ Max Unit Notes

+12V: 12 volt fan power supply 11.4 12.0 12.6 V —

IC: — • Maximum fan steady-state current draw — 1.2 — A • Average steady-state fan current draw — 0.5 — A • Maximum fan start-up current draw — 2.2 — A • Fan start-up current draw maximum duration — 1.0 — Second

SENSE: SENSE frequency — 2 — pulses per fan 1 revolution

CONTROL 21 25 28 kHz 2, 3 NOTES: 1. Baseboard should pull this pin up to 5V with a resistor. 2. Open drain type, pulse width modulated. 3. Fan will have pull-up resistor for this signal to maximum of 5.25 V.

Figure 11-6. Baseboard Power Header Placement Relative to Processor Socket

R110 [4.33] B

11.4 Thermal Specifications

This section describes the cooling requirements of the fan heatsink solution used by the boxed processor. 11.4.1 Boxed Processor Cooling Requirements

The boxed processor may be directly cooled with a fan heatsink. However, meeting the processor's temperature specification is also a function of the thermal design of the entire system, and ultimately the responsibility of the system integrator. The processor temperature specification is found in Chapter 6 of this document. The boxed processor fan heatsink is able to keep the processor temperature within the specifications (see Table 6-1) in chassis that provide good thermal management. For the boxed processor fan heatsink to operate properly, it is critical that the airflow provided to the fan heatsink is unimpeded. Airflow of the fan heatsink is into the center and out of the sides of the fan heatsink. Airspace is required around the fan to ensure that the airflow through the fan heatsink is not blocked. Blocking the airflow to the fan heatsink reduces the cooling efficiency and decreases fan life. Figure 11-7 and Figure 11-8 illustrate an acceptable airspace clearance for the fan heatsink. The air temperature entering the fan should be kept below 40 ºC. Again, meeting the processor's temperature specification is the responsibility of the system integrator.

98 Thermal/Mechanical Specifications and Design Guidelines Boxed Processor Specifications

Figure 11-7. Boxed Processor Fan Heatsink Airspace Keepout Requirements (top view)

Figure 11-8. Boxed Processor Fan Heatsink Airspace Keepout Requirements (side view)

Thermal/Mechanical Specifications and Design Guidelines 99 Boxed Processor Specifications

11.4.2 Variable Speed Fan

If the boxed processor fan heatsink 4-pin connector is connected to a 3-pin motherboard header it will operate as follows:

The boxed processor fan will operate at different speeds over a short range of internal chassis temperatures. This allows the processor fan to operate at a lower speed and noise level, while internal chassis temperatures are low. If internal chassis temperature increases beyond a lower set point, the fan speed will rise linearly with the internal temperature until the higher set point is reached. At that point, the fan speed is at its maximum. As fan speed increases, so does fan noise levels. Systems should be designed to provide adequate air around the boxed processor fan heatsink that remains cooler then lower set point. These set points, represented in Figure 11-9 and Table 11-2, can vary by a few degrees from fan heatsink to fan heatsink. The internal chassis temperature should be kept below 40 ºC. Meeting the processor's temperature specification (see Chapter 6) is the responsibility of the system integrator.

The motherboard must supply a constant +12 V to the processor's power header to ensure proper operation of the variable speed fan for the boxed processor. Refer to Table 11-1 for the specific requirements.

Figure 11-9. Boxed Processor Fan Heatsink Set Points

100 Thermal/Mechanical Specifications and Design Guidelines Boxed Processor Specifications

Table 11-2. Fan Heatsink Power and Signal Specifications

Boxed Processor Fan Heatsink Set Point Boxed Processor Fan Speed Notes (ºC)

X  30 When the internal chassis temperature is below or equal to this set point, 1 the fan operates at its lowest speed. Recommended maximum internal chassis temperature for nominal operating environment.

Y = 35 When the internal chassis temperature is at this point, the fan operates between its lowest and highest speeds. Recommended maximum internal chassis temperature for worst-case operating environment.

Z  40 When the internal chassis temperature is above or equal to this set point, the fan operates at its highest speed.

Note: 1. Set point variance is approximately ± 1 C from fan heatsink to fan heatsink.

If the boxed processor fan heatsink 4-pin connector is connected to a 4-pin motherboard header and the motherboard is designed with a fan speed controller with PWM output (CONTROL see Table 11-1) and remote thermal diode measurement capability, the boxed processor will operate as follows:

As processor power has increased, the required thermal solutions have generated increasingly more noise. Intel has added an option to the boxed processor that allows system integrators to have a quieter system in the most common usage.

The 4th wire PWM solution provides better control over chassis acoustics. This is achieved by more accurate measurement of processor die temperature through the processor's Digital Thermal Sensors (DTS) and PECI. Fan RPM is modulated through the use of an ASIC located on the motherboard that sends out a PWM control signal to the 4th pin of the connector labeled as CONTROL. The fan speed is based on actual processor temperature instead of internal ambient chassis temperatures.

If the new 4-pin active fan heat sink solution is connected to an older 3-pin baseboard processor fan header it will default back to a thermistor controlled mode, allowing compatibility with existing 3-pin baseboard designs. Under thermistor controlled mode, the fan RPM is automatically varied based on the Tinlet temperature measured by a thermistor located at the fan inlet.

Thermal/Mechanical Specifications and Design Guidelines 101 Boxed Processor Specifications

102 Thermal/Mechanical Specifications and Design Guidelines Component Suppliers

A Component Suppliers

Note: The part numbers listed below identifies the reference components. End-users are responsible for the verification of the Intel enabled component offerings with the supplier. These vendors and devices are listed by Intel as a convenience to Intel's general customer base, but Intel does not make any representations or warranties whatsoever regarding quality, reliability, functionality, or compatibility of these devices. Customers are responsible for thermal, mechanical, and environmental validation of these solutions. This list and/or these devices may be subject to change without notice.

Table A-1. Reference Heatsink

Item Intel PN Delta Foxconn Nidec

2011D Heatsink 1A01C7T00- F90T12MS1Z7- Assembly E41759-002 DTC-DAA07 DHA_XA02 64A01A1 RCFH7-1156 (DHA-A)

2011C Heatsink 1A01C7T00- F90T12MS1Z7- Assembly E41997-002 DTC-DAB03 DHB_XA02 64A01B1 RCFH6-1156 (DHA-B)

Table A-2. Reference Heatsink Components

Item Intel PN AVC ITW

Clip E36830-001 A208000389 N/A

Base: C33389 Base: C33389 Fastener N/A Cap: C33390 Cap: C33390

Table A-3. LGA1155 Socket and ILM Components

Item Intel PN Foxconn Molex Tyco Lotes

PE115527- LGA1155 Socket E52846-002 475962032 2069570-1 N/A 4041-01F

LGA115X ILM ACA-ZIF-078- E36142-002 PT44L61-6401 475969911 2013882-3 without cover Y02

LGA115X ILM with ACA-ZIF-078- G11449-001 PT44L81-6401 475968711 2069838-8 cover Y17

LGA115X ILM ACA-ZIF-127- G12451-001 012-1000-5377 475973003 1-2134503-1 cover only K01

LGA115X ILM DCA-HSK-144- Back Plate E36143-002 PT44P19-6401 475969930 2069838-2 Y09 (with Screws)

Note: Individual ILM covers are made availble for post-sales support.

Thermal/Mechanical Specifications and Design Guidelines 103 Component Suppliers

Table A-4. Supplier Contact Information

Supplier Contact Phone Email

AVC (Asia Vital +86 755 3366 8888 Kai Chang [email protected] Components Co., x63588 Ltd.)

William +1 510 668-5570 Delta [email protected] Bradshaw +86 136 8623 1080

Foxconn Julia Jiang +1 408 919 6178 [email protected]

ITW Fastex Chak Chakir +1 512 989 7771 [email protected]

Lotes Co., Ltd. Windy Wang +1 604 721 1259 [email protected]

Molex Carol Liang +86 21 504 80889 x3301 [email protected]

Nidec Karl Mattson +1 360 666 2445 [email protected]

Tyco Billy Hsieh +81 44 844 8292 [email protected]

The enabled components may not be currently available from all suppliers. Contact the supplier directly to verify time of component availability.

104 Thermal/Mechanical Specifications and Design Guidelines Mechanical Drawings

B Mechanical Drawings

Table B-1 lists the mechanical drawings included in this appendix.

Table B-1. Mechanical Drawing List

Drawing Description Figure Number

“Socket / Heatsink / ILM Keepout Zone Primary Side (Top)” Figure B-1

“Socket / Heatsink / ILM Keepout Zone Secondary Side (Bottom)” Figure B-2

“Socket / Processor / ILM Keepout Zone Primary Side (Top)” Figure B-3

“Socket / Processor / ILM Keepout Zone Secondary Side (Bottom)” Figure B-4

“Reference Design Heatsink Assembly” Figure B-5

“Reference Fastener (Sheet 1 of 4)” Figure B-6

“Reference Fastener (Sheet 2 of 4)” Figure B-7

“Reference Fastener (Sheet 3 of 4)” Figure B-8

“Reference Fastener (Sheet 4 of 4)” Figure B-9

“Reference Clip (Sheet 1 of 2)” Figure B-10

“Reference Clip (Sheet 2 of 2)” Figure B-11

“Thermocouple Attach Drawing” Figure B-12

“ILM Shoulder Screw” Figure B-13

“ILM Standard 6-32 Thread Fastener” Figure B-14

Thermal/Mechanical Specifications and Design Guidelines 105 Mechanical Drawings

Figure B-1. Socket / Heatsink / ILM Keepout Zone Primary Side (Top) L REV 2 OF 1 SHT. REV SHEET 2200 MISSION COLLEGE BLVD. P.O. BOX 58119 SANTA CLARA, CA 95052-8119 R E21319_REV_L_PAE 1 L DO NOT SCALE DRAWING E21319_REV_L_PAE DWG. NO LGA1156 & 1155 SOCKET ATX KEEP-INS SIZE DRAWING NUMBER A1 DEPARTMENT TITLE SCALE: NONE LEGEND SOCKET/THERMAL/MECHANICAL COMPONENT KEEP-INS 10.10 MM MAX COMPONENT HEIGHT 7 1.6 MM MAX COMPONENT HEIGHT 7 1.2 MM MAX COMPONENT HEIGHT 7 BOARD ROUTING KEEP-OUT 27 MM MAX COMPONENT HEIGHT 7 BOARD ROUTING SURFACE TRACE KEEP-OUT 2.07 MM MAX COMPONENT HEIGHT 7 2.5 MM MAX COMPONENT HEIGHT 7 26 MM MAX COMPONENT HEIGHT 7

THIRD ANGLE PROJECTION UNLESS OTHERWISE SPECIFIED (95.00 ) DIMENSIONS ARE IN MILLIMETERS

INTERPRET DIMENSIONS AND TOLERANCES IN ACCORDANCE WITH ASME Y14.5M-1994 (75.00 2X) (36.00 ) NO ROUTE NO ROUTE ON NPTH 2X39.01 2X29.67 2X39.01 +0.05 -0.03 +0.05 -0.03 +0.05 -0.03 47.50 29.67 28.00 26.00 25.70 23.70 18.00 18.00 23.70 25.70 26.00 30.00 37.63 47.50 6.00 6.00 4.03 SILKSCREEN OUTLINE ON PRIMARY SIDE AS SHOWN

4X PRIMARY & SECONDARY SIDES 6 3X 3 X ALL OTHER LAYERS 4.70 NO ROUTE ON 4X

46.89

45.50

37.31 2X38.40

37.54

2X36.89

33.80

26.70 28.46

25.81 25.79

21.25 23.81

18.90 20.90 10.00 PACKAGE BOUNDRY

)95.0

0.00 2

NPTH 5.40 (95.00 )

( (75.00 2X)

10.50

+0.05 -0.03 10.00 PIN 1

3.80

20.13 2X21.25 BOARD PRIMARY SIDE

ILM BOUNDRY 5 27.02

2X25.25 LEVER UNHOOKED POSITION 3X

29.69

35.03

35.21

2X38.12

40.71

38.18

40.71

39.63

40.10 48.12 0.00 EAST 2 2X37.56 2X37.50 2X37.50 6.15 7.62 6.15 2.54 29.08 26.11 21.25 13.97 31.61 32.50 35.80 46.42 2X39.49 SOUTH NORTH 7.00 34.42 6.00 26.40 () WEST NO ROUTE ON 2 GEOMETRIC CENTER OF SOCKET HOUSING CAVITY. 5 REFER TO INTEL PART DRAWING E21320 FOR ILM AND SOCKET KEEPIN VOLUME DIMENSIONS. 6 COPPER PAD ON PRIMARY SIDE, NON-GROUNDED. 7 COMBINED COMPONENT AND SOLDER PASTE HEIGHT INCLUDING TOLERANCES AFTER REFLOW. NOTES: 1. DIMENSIONS ARE IN MILLIMETERS. 3. BOARD COMPONENET KEEP-INS AND MECHANICAL KEEP-OUTS TO BE UTILIZED WITH SUFFICIENT ALLOWANCES FOR PLACEMENT AND SIZE TOLERANCES, ASSEMBLY PROCESS ACCESS, AND DYNAMIC EXCURSIONS. 4. ASSUME SYMMETRY FOR UNDIMENSIONED CORNERS AND EDGES. COPPER PAD CAN INSET A MAXIMUM OF 0.127MM FROM THE NO ROUTE EDGE. PRIMARY SIDE 6

106 Thermal/Mechanical Specifications and Design Guidelines Mechanical Drawings

Figure B-2. Socket / Heatsink / ILM Keepout Zone Secondary Side (Bottom) L REV 2 OF 2 SHEET DO NOT SCALE DRAWING E21319_REV_L_PAE 1.000 SIZE DRAWING NUMBER SOCKET & PROCESSOR SOCKET A1 SCALE: VOLUMETRIC KEEP-IN OUTLINE 2200 MISSION COLLEGE BLVD. P.O. BOX 58119 SANTA CLARA, CA 95052-8119 R DEPARTMENT ROUTING KEEPOUTS KEEPINS INTEL PN E21320 VOLUMETRIC KEEP-IN SOCKET & PROCESSOR SOCKET 18.00 18.00 COMPONENT VOLUMETRIC 6.00 (36.00 ) 10.00 26.00 4X 26.00 4X

(18.72 )

37.54

25.81

13.67

2 4X R1.8 0.00 (27.33 )

(61.02 )

(78.25 ) 13.67

35.21 35.21 BOARD SECONDARY SIDE LEGEND

KEEP-OUT 40.71 ROUTING AND COMPONENT KEEP-OUT MAX COMPONENT HEIGHT 2.54MM 9.36 9.36 0.00 7.05 10.80 EAST 2 SOUTH NORTH COMPONENT WEST (52.00 )

Thermal/Mechanical Specifications and Design Guidelines 107 Mechanical Drawings

Figure B-3. Socket / Processor / ILM Keepout Zone Primary Side (Top) J REV 2 78.25 OF 1 SHEET 42.50 () 6 27.33 2200 MISSION COLLEGE BLVD. P.O. BOX 58119 SANTA CLARA, CA 95052-8119 19.99 R E21320 B SECONDARY SIDE COMPONENT CLEARANCE DO NOT SCALE DRAWING PRIMARY SIDE COMPONENT CLEARANCE LGA1156 & 1155 SOCKET, ILM & PROCESSOR KEEPIN 1.000 PST-TMI SIZE DRAWING NUMBER A1 DEPARTMENT TITLE SCALE: 6 12.29 49.50 42.50 () C 18.72 BOTTOM SIDE 3.75 11.75 2 94.76 B () POSITION 8.12 37.54 3X 6.34 () 2.50 1.50 () 4.00 () 6.55 15.16 LEVER UNLATCHED () 7.00 1.50 () TYP PCB THICKNESS 7 2.50 170.0 C 8 (R )65.21 (R )46.51 42.50 49.50 130.0 () 3X 5.00 SECTION B-B LOAD PLATE OPENING MOTION SPACE 21.25 8 7 70.37 TO OPEN LID TO LEVER STOP SEE DETAIL A 2 17.00 5 3X 2.58 8.97 B 8.12 2.50 3.75 CLEARANCE NEEDED FOR WIRE TRAVEL 9.26 A MIN LEVER MOTION SPACE MAX LEVER MOTION SPACE B 51.00 9.26 8.97 15.92 C TOP SIDE C SECTION A-A 1 A B 4.00 1.25 6.76 6.76 13.00 37.54 40.71 3.18 19.50 3.18 5.50 1.75 1 SOCKET CENTER PLANES ARE REFERENCED FROM GEOMETRIC 2 SOCKET KEEP-IN VOLUME VERTICAL HEIGHT ESTABLISHES LIMIT OF 5 NO COMPONENT BOUNDARY-FINGER ACCESS AREA 6 MOTHERBOARD BACKSIDE COMPONENT KEEP-IN 7 MAXIMUM OPEN ANGLE TO LOAD PLATE 8 MINIMUM OPEN ANGLE TO CLEAR LOAD PLATE NOTES: CENTER OF SOCKET HOUSING CAVITY FOR CPU PACKAGE (ALIGNS WITH DATUM REFERENCE GIVEN FOR BOARD COMPONENT KEEP-INS). AND CPU PACKAGE ASSEMBLY IN THE SOCKET LOCKED DOWN POSITION. IT ENCOMPASSES SOCKET AND CPU PACKAGE DIMENSIONAL TOLERANCES AND DEFLECTION / SHAPE CHANGES DUE TO ILM LOAD. 3. SOCKET KEEP-IN VOLUME ENCOMPASS THE NOMINAL AND ALLOWANCES FOR SIZE TOLERANCES. THERMAL/MECHANICAL COMPONENT DEVELOPERS SHALL DESIGN TO THE OUTSIDE OF SOCKET KEEP IN VOLUME WITH CLEARANCE MARGINS. SOCKET DEVELOPERS SHALL DESIGN TO THE INSIDE VOLUME. 4.DIMENSIONS ARE IN MILLIMETERS 78.25 ()

108 Thermal/Mechanical Specifications and Design Guidelines Mechanical Drawings

Figure B-4. Socket / Processor / ILM Keepout Zone Secondary Side (Bottom) J REV 2 18.12 OF 2 () SHEET 17.00 10.97 LEVER UNLATCHED 6.30 () DO NOT SCALE DRAWING TOP SIDE VIEW 3.50 8.00 3.50 SIZE DRAWING NUMBER A1 E21320 SCALE: NONE 15.83 () 13.75 11.78 () () DETAIL A 0.00

23.81

37.31 25.70

C 0.00 ADD SILKSCREEN OUTLINE ON PCB PRIMARY SIDE AS SHOWN

TOP SIDE PCB ILM SILKSCREEN 25.70 B B

NPTH 5 FINGER ACCESS +0.05 -0.03 COMPONENT KEEPOUT AREA +0.05 -0.03 6.00 3.80 0.1 B C 10.50 () NO ROUTE ON PRIMARY & SECONDARY SIDES 3X 3 X ALL OTHER LAYERS 4.70 NO ROUTE ON COPPER PAD ON PRIMARY SIDE, NON-GROUNDED. COPPER PAD CAN INSET MAXIMUM OF .127MM FROM THE NO ROUTE EDGE

47.50

() 18.00

R3.50 0.00 C

25.50 18.00 PIN 1 TOP SIDE PCB ILM MOUNTING HOLES 25.81 35.21 40.71 0.00

Thermal/Mechanical Specifications and Design Guidelines 109 Mechanical Drawings

Figure B-5. Reference Design Heatsink Assembly

110 Thermal/Mechanical Specifications and Design Guidelines Mechanical Drawings

Figure B-6. Reference Fastener (Sheet 1 of 4)

(

Thermal/Mechanical Specifications and Design Guidelines 111 Mechanical Drawings

Figure B-7. Reference Fastener (Sheet 2 of 4)

112 Thermal/Mechanical Specifications and Design Guidelines Mechanical Drawings

( Figure B-8. Reference Fastener (Sheet 3 of 4)

Thermal/Mechanical Specifications and Design Guidelines 113 Mechanical Drawings

Figure B-9. Reference Fastener (Sheet 4 of 4)

114 Thermal/Mechanical Specifications and Design Guidelines Mechanical Drawings

Figure B-10. Reference Clip (Sheet 1 of 2) D C B A 01 REV APPROVED 1 1 SHEET 1 OF 2 DATE 2200 MISSION COLLEGE BLVD. P.O. BOX 58119 SANTA CLARA, CA 95052-8119 E36830 R CORP. A DRAWING NUMBER HEAT SINK CLIP DO NOT SCALE DRAWING DESCRIPTION D SHT. REV HAVENDALE POWER ON SAMPLE PST REVISION HISTORY CAGE CODE DEPARTMENT DESCRIPTION TITLE SIZE SCALE: 3:1 E36830 1 2 - - PARTS LIST 04/02/03 02/04/08 DATE DATE DATE DATE SEE NOTES SEE NOTES A RELEASE FOR PROTOTYPING 02/04/08 NA DWG. NO CLIP, STEEL, STAMPED ZONE REV - - DESIGNED BY DRAWN BY CHECKED BY APPROVED BY MATERIAL: FINISH: R. AOKI KG TAN PART NUMBER E36830-001 TOP ITEM NO 5 PUNCH DIRECTION 7 CRITICAL TO FUNCTION DIMENSION 8 COINING REQUIRED AS SPECIFIED NOTES: 1. THIS DRAWING TO BE USED IN CONJUNTION WITH SUPPLIED 3D DATABASE FILE. ALL DIMENSIONS AND TOLERANCES ON THIS DRAWING TAKE PRECEDENCE OVER SUPPLIED FILE AND ARE APPLICABLE AT PART FREE, UNCONSTRAINED STATE UNLESS INDICATED OTHERWISE. 2. MATERIAL: A) TYPE: AISI 1065 COLD DRAWN STEEL OR EQUIVALENT 1.6MM THICKNESS B) CRITICAL MECHANICAL MATERIAL PROPERTIES FOR EQUIVALENT MATERIAL SELECTION: ELASTIC MODULUS > 206.8 GPA [29,900 KSI] .02 [.063"] MIN TENSILE YIELD STRENGTH (ASTM D638) > 380 MPa [55KSI] C) MASS - 37.7 GRAMS (REF) 3. SECONDARY OPERATIONS: A) FINISH: NICKEL PLATE REQUIRED AFTER FORMING 4. ALL DIMENSIONS AND TOLERANCES ARE SHOWN AFTER PLATING 6. BREAK ALL SHARP CORNERS AND BURRS 9. SECONDARY UNIT TOLERANCES SHOULD BE CALCULATED FROM PRIMARY UNITS TO AVOID ROUND OFF ERROR. 3 3 -001 -002 THIRD ANGLE PROJECTION QTY PER ASSY UNLESS OTHERWISE SPECIFIED: DIMENSIONS ARE IN MILLIMETERS. 1 TOLERANCES: LINEAR ANGLES: .15 INTERPRET DIMENSIONS AND TOLERANCES PER ANSI Y14.5M-1994 -003 7 .007 0.2 4 4 .166 4.22 [] SEE DETAIL A A .007 0.2 .079 [] 2 5 5 7 .007 REMOVE ALL BURRS OR SHARP EDGES AROUND PERIMETER OF PART. SHARPNESS OF EDGES SUBJECT TO HANDLING ARE REQUIRED MEET THE UL1439 TEST. PERMANENTLY MARK PART NUMBER AND REVISION LEVEL APPROXIMATELY WHERE SHOWN XXXXXX-XXX REV XX 0.2 A 1.333 [] 33.86 .007 0.2 .394 0.5 [.01] A B [] 4X 10 6 6 SECTION A-A 7 3.890 98.8 [] B 1.643 41.73 [] 7 7 .007 SEE DETAIL B 0.2 2.106 [] SQ 53.5 0.5 [.01] A B .063 7 8 8 1.60 [] A () SEE DETAIL D 3.890 98.8 [] SEE DETAIL C D C B A

Thermal/Mechanical Specifications and Design Guidelines 115 Mechanical Drawings

Figure B-11. Reference Clip (Sheet 2 of 2) 01 REV 1 1 SHEET 2 OF 2 E36830 .0177 0.45 [] R MIN 01 DRAWING NUMBER DO NOT SCALE DRAWING D SHT. REV SIZE SCALE: 3:1 E36830 2 DETAIL B SCALE 10:1 2 DWG. NO 2200 MISSION COLLEGE BLVD. P.O. BOX 58119 SANTA CLARA, CA 95052-8119 R CORP. A TMD 3 3 DEPARTMENT A X 0.4 [.01] A B 0.5 [.01] A B .141 3.57 [] W X 4X 43.1 4 4 DETAIL D SCALE 10:1 W .055 [] R1.4 5 5 .122 [] DIMENSION ON SHEET 1 ZONE A7 R3.1 THIS POINT CORRESPONDES TO THE 41.73 .042 1.06 [] 7 .065 1.65 [] .0118 .1417 0.3 [] [] R TYP 6 6 0.1 [.003] A B 2X R3.6 0.2 [.007] A B BOUNDARY 45 X 0.25 [.010 0.05 8 .001] DETAIL C SCALE 10:1 TYP 4 PLACES .289 .2894 7.34 [] 7.35 [] .0197 [] 7 7 135 2X R0.5 DETAIL A SCALE 10:1 TYPICAL 4 PLACES .2087 5.3 [] 8 8

116 Thermal/Mechanical Specifications and Design Guidelines Mechanical Drawings

Figure B-12. Thermocouple Attach Drawing A B REV 03 SHEET 1 OF DETAIL D SCALE 15 : 1 1 1 E38918 CHANDLER, ARIZONA 85226 5000 W. CHANDLER BLVD. 0.25 ±0.05 DO NOT SCALE DRAWING 2X R0.010 ±0.002 03 DRAWING NUMBER THERMOCOUPLE ATTACH NOTE DIRECTION OF MILLED GROOVE RELATIVE TO ALIGNMENT NOTCHES. 1 LGA 1160 IHS GROOVE FOR SOLDER SH. REV.

1.02 ±0.25 CAGE CODE 0.040 ±0.010 B SCALE: 2:1 DEPARTMENT SIZE

TITLE 0.38 ±0.03 0.015 ±0.001 0.79 ±0.15 0.031 ±0.006 2 3/04/2008

3/04/2008 DATE DATE DATE DETAIL C SCALE 15 : 1 DETAIL B SCALE 10 : 1 DWG. NO. PROJECTION THIRD ANGLE

DESIGNED BY DATE DRAWN BY CHECKED BY APPROVED BY 0.5 7. 0.381 ±0.038 0.0150 ±0.0015 PACKAGE CENTER 0.51 ±0.08 0.020 ±0.003 SECTION A-A 0.001 0.05 0.2 ANGLES: TOLERANCES: ASME Y14.5M-1994. B INTERPRET DIM AND TOL PER DIMENSIONS ARE IN INCHES. UNLESS OTHERWISE SPECIFIED: 3 .XXX .XX TOL: .X FINISH: MATERIAL: PACKAGE EDGES PACKAGE CENTER REFERENCED FROM PACKAGE EDGES C A A 4 43 D

NOTES: UNLESS OTHERWISE SPECIFIED 1. NORMAL AND LATERAL LOADS ON THE IHS MUST BE MINIMIZED DURING MACHINING. 2. MACHINE WITH CLEAN DRY AIR ONLY, NO FLUIDS OR OILS. 3. ALL MACHINED SURFACES TO BE #32 MILL FINISH OR BETTER. 4. IHS MATERIAL IS NICKEL PLATED COPPER. 5. CUT DIRECTION/ORIENTATION OF GROOVE IS AS SHOWN. 6. ALL MACHINED EDGES ARE TO BE FREE OF BURRS. 7. THE 0.0150 DEPTH AT PACKAGE CENTER IS CRITICAL.

THIS DRAWING CONTAINS INTEL CORPORATION CONFIDENTIAL INFORMATION. IT IS DISCLOSED IS IT INFORMATION. CONFIDENTIAL CORPORATION INTEL CONTAINS DRAWING THIS IN CONFIDENCE AND ITS CONTENTS MAY NOT BE DISCLOSED, REPRODUCED, DISPLAYED OR DISPLAYED REPRODUCED, DISCLOSED, BE NOT MAY CONTENTS ITS AND CONFIDENCE IN MODIFIED, WITHOUT THE PRIOR WRITTEN CONSENT OF INTEL CORPORATION. INTEL OF CONSENT WRITTEN PRIOR THE WITHOUT MODIFIED, A B

Thermal/Mechanical Specifications and Design Guidelines 117 Mechanical Drawings

Figure B-13. ILM Shoulder Screw

118 Thermal/Mechanical Specifications and Design Guidelines Mechanical Drawings

Figure B-14. ILM Standard 6-32 Thread Fastener

Thermal/Mechanical Specifications and Design Guidelines 119 Mechanical Drawings

120 Thermal/Mechanical Specifications and Design Guidelines Socket Mechanical Drawings

C Socket Mechanical Drawings

Table C-1 lists the mechanical drawings included in this appendix.

Table C-1. Mechanical Drawing List

Drawing Description Figure Number

“Socket Mechanical Drawing (Sheet 1 of 4)” Figure C-1

“Socket Mechanical Drawing (Sheet 2 of 4)” Figure C-2

“Socket Mechanical Drawing (Sheet 3 of 4)” Figure C-3

“Socket Mechanical Drawing (Sheet 4 of 4)” Figure C-4

Thermal/Mechanical Specifications and Design Guidelines 121 Socket Mechanical Drawings

Figure C-1. Socket Mechanical Drawing (Sheet 1 of 4)

122 Thermal/Mechanical Specifications and Design Guidelines Socket Mechanical Drawings

Figure C-2. Socket Mechanical Drawing (Sheet 2 of 4)

Thermal/Mechanical Specifications and Design Guidelines 123 Socket Mechanical Drawings

( Figure C-3. Socket Mechanical Drawing (Sheet 3 of 4)

124 Thermal/Mechanical Specifications and Design Guidelines Socket Mechanical Drawings

Figure C-4. Socket Mechanical Drawing (Sheet 4 of 4)

Thermal/Mechanical Specifications and Design Guidelines 125 Socket Mechanical Drawings

126 Thermal/Mechanical Specifications and Design Guidelines Package Mechanical Drawings

D Package Mechanical Drawings

Table D-1 lists the mechanical drawings included in this appendix.

Table D-1. Mechanical Drawing List

Drawing Description Figure Number

“Processor Package Drawing (Sheet 1 of 2)” Figure D-1

“Processor Package Drawing (Sheet 2of 2)” Figure D-2

Thermal/Mechanical Specifications and Design Guidelines 127 Package Mechanical Drawings

Figure D-1. Processor Package Drawing (Sheet 1 of 2)

128 Thermal/Mechanical Specifications and Design Guidelines Package Mechanical Drawings

Figure D-2. Processor Package Drawing (Sheet 2of 2)

Thermal/Mechanical Specifications and Design Guidelines 129 Package Mechanical Drawings

130 Thermal/Mechanical Specifications and Design Guidelines Heat Sink Back Plate Drawings

E Heat Sink Back Plate Drawings

This heat sink back plate design is intended to adapt as a reference for OEMs that use threaded fasteners on customized thermal solution, to comply with the mechanical and structural requirements for the LGA1155 socket. The heat sink back plate does not have to provide additional load for socket solder joint protect. Structural design strategy for the heat sink is to provide sufficient load for the Thermal Interface Material (TIM) and to minimize stiffness impact on the motherboard.

Note: Design modifications for specific application and manufacturing are the responsibility of OEM and the listed vendors for customized system implementation and validation. These vendors and devices are listed by Intel as a convenience to Intel's general customer base, but Intel does not make any representations or warranties whatsoever regarding quality, reliability, functionality, or compatibility of these devices. Customers are responsible for thermal, mechanical, and environmental validation of these solutions. This list and/or these devices may be subject to change without notice.

Please refer to the motherboard keep out zone listed in Appendix B to ensure compliant with the heat sink back plate implementation. Figure E-1 is the heat sink back plate keep in zone for the design implementation.

Table E-1 lists the mechanical drawings included in this appendix. Table E-2 lists the mechanical drawings

Table E-1. Mechanical Drawing List

Drawing Description Figure Number

“Heat Sink Back Plate Keep In Zone” Figure E-1

“Heat Sink Back Plate” Figure E-2

“Reference Design ILM Back Plate” Figure E-3

Table E-2. Supplier Contact Information

Supplier Contact Phone Email

CCI (Chaun Choung Monica Chih +886-2-29952666 x1131 [email protected] Technology Corp.)

The enabled components may not be currently available from supplier. Contact the supplier directly to verify time of component availability.

Thermal/Mechanical Specifications and Design Guidelines 131 Heat Sink Back Plate Drawings

Figure E-1. Heat Sink Back Plate Keep In Zone B REV 1 OF 1 95 SHEET 34.21 27.81 2200 MISSION COLLEGE BLVD. P.O. BOX 58119 SANTA CLARA, CA 95052-8119 R 13.9 E58389_REV_B_PAE DO NOT SCALE DRAWING - 2 LGA 1156 & 1155 HS BACKPLATE KEEP IN SIZE DRAWING NUMBER A1 DEPARTMENT TITLE SCALE: 5 3X 36 95 19.19 C 1 1 B 35.22 2X 25.81 A 5.08 2.54 72.75 9.25 4X 2X 37.54 1 26 MAX C 2X 75 4 26 MAX 4 B 1 38.12 2X 75 78.25 1 SOCKET CENTER PLANES ARE REFERENCED FROM GEOMETRIC 4 OUTLINE OF LGA 1156 & 1155 ILM BACKPLATE FOR REFERENCE ONLY. NOTES: CENTER OF SOCKET HOUSING CAVITY FOR CPU PACKAGE (ALIGNS WITH DATUM REFERENCE GIVEN FOR BOARD COMPONENT KEEP-INS). 3. LGA 1156 & 1155 HS BACKPLATE KEEP-IN VOLUME ENCOMPASS THE NOMINAL AND ALLOWANCES FOR SIZE TOLERANCES. THERMAL/MECHANICAL COMPONENT DEVELOPERS SHALL DESIGN TO THE OUTSIDE OF SOCKET H1 ILM BACKPLATE WITH CLEARANCE MARGINS. REFERENCE DRAWINGS: 4 E20847 - LGA 1156 & 1155 ILM BACKPLATE E21320 - LGA 1156 & 1155 ILM 5. DIMENSIONS ARE IN MILLIMETERS & PROCESSOR KEEPIN

132 Thermal/Mechanical Specifications and Design Guidelines Heat Sink Back Plate Drawings

Figure E-2. Heat Sink Back Plate

Thermal/Mechanical Specifications and Design Guidelines 133 Heat Sink Back Plate Drawings

Figure E-3. Reference Design ILM Back Plate E REV APPROVE 1 1 DATE 06/16/08 CCB 8/17/07 D. CARTE 2200 MISSION COLLEGE BLVD P.O. BOX 58119 SANTA CLARA, CA 95052-8119 R DO NOT SCALE DRAWING LGA115X ILM BACKPLATE DESCRIPTION REVISION HISTORY 4 SCALE 2 DESCRIPTION PST-TMI SIZE DRAWING NUMBER A1 E20847 DEPARTMENT TITLE MODIFIED TOLERANCES PARTS LIST -003: MODIFIED CAVITY DIMENSION, DATE 12/17/07 DATE 12/17/07 DATE 12/27/07 12/18/07 DATE 01/03/08 FINISH D E UPDATED FINISH/PLATING SPEC. 1/29/09 - A INITIAL RELEASE D3 BG7 UPDATED MATERIAL PROPERTIES NOTES C 8/29/07 -002: ADDED CHAMFER D. CARTE 01/03/08 T.BYQUIS ZONE REV ILM BACKPLATE DESIGNED BY DRAWN BY CHECKED BY APPROVED BY MATERIAL R. AOKI K. SHIMADA R. AOKI B. DALE T.BYQUIST 3 CRITICAL TO FUNCTION (CTF). 8 PUNCH DIRECTION. NOTES: 1. THIS DRAWING TO BE USED IN CONJUNCTION WITH THE SUPPLIED 3D DATABASE FILE. ALL DIMENSIONS AND TOLERANCES ON THIS DRAWING TAKE PRECEDENCE OVER SUPPLIED FILE. 2. UNLESS OTHERWISE NOTED, TOLERANCES ON DIMENSIONED FEATURES ARE AS IN TOLERANCE BLOCK. 4. MATERIAL: A) TYPE: 1.8MM ± B) CRITICAL MECHANICAL PROPERTIES FOR 0.05 EQUIVALENT MATERIAL SELECTION: TENSILE YEILD STRENGTH (ASTM D638) >= 489 MPa 3 MODULUS OF ELASTICITY (ASTM D638) >= 190 GPa , SK7, 1065, S50C OR CHSP60PC. 5. FINISH: 5 MICRON MIN. ZINC PLUS CLEAR CHROMATE PER ASTM B 633 COLORLESS OR 2 MICRON MIN. ELECTROLYTIC NICKEL PLATING. PROCESS TEST: 48 HRS 85°6. REMOVE ALL BURRS OR SHARP EDGES AROUND PERIMETER OF PART. SHARPNESS OF EDGES SUBJECT TO HANDLING ARE REQUIRED MEET C/85% HUMIDITY WITH NO VISIBLE CORROSION. UL1439 TEST. 7. PART SHALL BE DEGREASED AND FREE OF OIL DIRT MARKS. PART NUMBER E20847-003 ANGLES ±1 DIMENSIONS ±0.5 ALL UNTOLERANCED LINEAR TOP THIRD ANGLE PROJECTION ITEM NO UNLESS OTHERWISE SPECIFIED DIMENSIONS ARE IN MILLIMETERS QTY

INTERPRET DIMENSIONS AND TOLERANCES IN ACCORDANCE WITH ASME Y14.5M-1994 3 3 0.2 0.15 A0.1 B C A 18 18 A 5X R4± 1 (1.8 ) 3X PIERCE AND TAP 6-32 UNC THRU HOLE MIN 3 THREAD 2X 30.11 4.3 0.2 A B C 29.5±0.1 C.L. OF C 4X MAX R1.8 8 71.9±0.3 30.91 5± 0.15 2X R4± 1 CHAMFER X 45° 3.25± 0.5 1 2X 5.5± 0.15 2X RMAX 0.2 A B 20.9±0.1 C B 47.6±0.3 THIS DRAWING CONTAINS INTEL CORPORATION CONFIDENTIAL INFORMATION. IT IS DISCLOSED IN CONFIDENCE AND ITS CONTENTS MAY NOT BE DISCLOSED, REPRODUCED, DISPLAYED OR MODIFIED, WITHOUT THE PRIOR WRITTEN CONSENT OF INTEL CORPORATION.

134 Thermal/Mechanical Specifications and Design Guidelines